Wear a smartwatch with your Longines Master Collection

Wear a smartwatch with your Longines Master Collection

500 Longines Master Collection references fit Smartlet One. Lug widths 18mm to 22mm, natively supported with no adapter. Installation uses the standard spring bars, with no modification to the watch, and is fully reversible.
Explore
Forbes · CNET
|
300+ clients
|
35+ countries
|
CES 2026 · Lépine 2025
|
Patented
Master Collection compatibility

Wear a smartwatch with your Longines Master Collection

In short 500 Longines Master Collection references fit Smartlet One. Lug widths 18mm to 22mm, natively supported with no adapter. Installation uses the standard spring bars, with no modification to the watch, and is fully reversible.

The Master Collection is Longines’ classic line of automatic dress watches, from three-hand references to moon phases, annual calendars and chronographs. Most references keep classic lugs with spring bars.

Wear yours How it works
The problem
Choosing between health data and horological heritage every morning.
The solution
Smartlet One replaces your Longines Master Collection strap via the standard spring bars and positions your smartwatch on the same wrist, underneath. Both run simultaneously, with no modification to the watch.
Model
Master Collection
Lug width
21mm
References
500covered
Reversible
In seconds

Choose your edition

One mechanism. Three personalities.

Every Smartlet One includes the dedicated adapter for your wearable. Pick the finish that matches your style.

Smartlet One - Shadow - Smartlet

For the explorer

Smartlet One - Shadow

€399,00

5.0 (21)

Stealth. Switch in seconds, leave no trace.

  • Material SS316L steel, black PVD
  • Weight ~100g
  • Compatible with Rolex, Omega, Seiko + 100 more
Buy now
Compatibility

Master Collection models supported

Covered references

500 references covered.

ReferenceMaterialDialLugSmartlet
L2.910.4.78.3Steel 40mmSilver21mmCompatible
L2.629.4.51.6Steel 42mmBlack21mmCompatible
L2.673.4.78.3Steel 40mmSilver21mmCompatible
L2.629.4.78.3Steel 40mmSilver21mmCompatible
L2.628.4.78.6Steel 38mmSilver20mmCompatible
L2.893.4.79.2Steel 42mmBlue21mmCompatible
L2.673.4.78.6Steel 40mmSilver21mmCompatible
L2.909.4.92.6Steel 42mmBlue21mmCompatible
L2.409.4.78.6Steel 38.5mmSilver18mmCompatible
L2.357.0.70.2Stainless steel 34mmSilver18mmCompatible
L2.357.0.73.2Stainless steel 34mmSilver18mmCompatible
L2.357.0.73.6Stainless steel 34mmSilver18mmCompatible
L2.357.4.07.2Stainless steel 34mmBeige18mmCompatible
L2.357.4.07.6Stainless steel 34mmBeige18mmCompatible
L2.357.4.08.6Stainless steel 34mmOrange18mmCompatible
L2.357.4.70.2Stainless steel 34mmSilver18mmCompatible
L2.357.4.70.6Stainless steel 34mmSilver18mmCompatible
L2.357.4.72.6Stainless steel 34mmSilver18mmCompatible
L2.357.4.73.6Stainless steel 34mmSilver18mmCompatible
L2.357.4.78.6Stainless steel 34mmSilver "barleycorn"18mmCompatible
L2.357.4.87.0Stainless steel 34mmMother of pearl18mmCompatible
L2.357.4.87.6Stainless steel 34mmWhite mother-of-pearl18mmCompatible
L2.357.4.97.6Stainless steel 34mmSunray blue18mmCompatible
L2.357.4.98.6Stainless steel 34mmBlue18mmCompatible
L2.357.4.99.6Stainless steel 34mmGreen18mmCompatible
L2.357.5.70.2Stainless steel 34mmSilver18mmCompatible
L2.357.5.70.7Stainless steel 34mmSilver18mmCompatible
L2.357.5.72.2Stainless steel 34mmSilver18mmCompatible
L2.357.5.72.7Stainless steel 34mmSilver18mmCompatible
L2.357.5.87.7Stainless steel and 18 karat yellow gold cap 200 34mmWhite mother-of-pearl18mmCompatible
L2.357.5.89.7Stainless steel and 18 karat rose gold cap 200 34mmWhite mother-of-pearl18mmCompatible
L2.409.4.87.0Stainless steel 34mmWhite mother-of-pearl18mmCompatible
L2.409.4.87.4Stainless steel 34mmWhite mother-of-pearl18mmCompatible
L2.409.4.87.6Stainless steel 34mmWhite mother-of-pearl18mmCompatible
L2.409.4.97.0Stainless steel 34mmBlue18mmCompatible
L2.409.4.97.6Stainless steel 34mmSunray blue18mmCompatible
L2.409.5.89.7Stainless steel and 18 karat rose gold cap 200 34mmWhite mother-of-pearl18mmCompatible
L2.409.8.87.218 karat rose gold 34mmWhite mother-of-pearl18mmCompatible
L2.450.4.73.6Stainless steel 34mmWhite18mmCompatible
L2.450.4.87.2Stainless steel 34mmWhite mother-of-pearl18mmCompatible
L2.450.4.87.6Stainless steel 34mmWhite mother-of-pearl18mmCompatible
L2.450.5.87.2Stainless steel 34mmMother of pearl18mmCompatible
L2.450.5.89.2Stainless steel and 18 karat rose gold cap 200 34mmWhite mother-of-pearl18mmCompatible
L2.503.0.03.2Stainless steel 36mmBrown19mmCompatible
L2.503.0.03.3Stainless steel 36mmBrown19mmCompatible
L2.503.0.03.6Stainless steel 36mmBrown19mmCompatible
L2.503.0.07.2Stainless steel 36mmBrown19mmCompatible
L2.503.0.07.3Stainless steel 36mmBrown19mmCompatible
L2.503.0.07.6Stainless steel 36mmBrown19mmCompatible
L2.503.0.57.3Stainless steel 36mmBlack19mmCompatible
L2.503.0.57.6Stainless steel 36mmBlack19mmCompatible
L2.503.0.83.2Stainless steel 36mmMother of pearl19mmCompatible
L2.503.0.83.3Stainless steel 36mmMother of pearl19mmCompatible
L2.503.0.83.6Stainless steel 36mmMother of pearl19mmCompatible
L2.503.0.87.2Stainless steel 36mmMother of pearl19mmCompatible
L2.503.0.87.3Stainless steel 36mmMother of pearl19mmCompatible
L2.503.0.87.6Stainless steel 36mmMother of pearl19mmCompatible
L2.503.0.93.2Stainless steel 36mmMother of pearl19mmCompatible
L2.503.0.93.3Stainless steel 36mmMother of pearl19mmCompatible
L2.503.0.93.6Stainless steel 36mmMother of pearl19mmCompatible
L2.503.0.97.2Stainless steel 36mmMother of pearl19mmCompatible
L2.503.0.97.3Stainless steel 36mmMother of pearl19mmCompatible
L2.503.0.97.6Stainless steel 36mmMother of pearl19mmCompatible
L2.518.0.87.3Stainless steel 36mmMother of pearl19mmCompatible
L2.518.0.87.6Stainless steel 36mmMother of pearl19mmCompatible
L2.518.4.51.2Stainless steel 36mmBlack19mmCompatible
L2.518.4.51.3Stainless steel 36mmBlack19mmCompatible
L2.518.4.51.5Stainless steel 36mmBlack19mmCompatible
L2.518.4.51.6Stainless steel 36mmBlack19mmCompatible
L2.518.4.57.6Stainless steel 36mmBlack19mmCompatible
L2.518.4.77.3Stainless steel 36mmWhite19mmCompatible
L2.518.4.77.5Stainless steel 36mmWhite19mmCompatible
L2.518.4.77.6Stainless steel 36mmWhite19mmCompatible
L2.518.4.78.2Stainless steel 36mmWhite19mmCompatible
L2.518.4.78.3Stainless steel 36mmWhite19mmCompatible
L2.518.4.78.5Stainless steel 36mmWhite19mmCompatible
L2.518.4.78.6Stainless steel 36mmWhite19mmCompatible
L2.518.4.88.2Stainless steel 36mmMother of pearl19mmCompatible
L2.518.4.88.6Stainless steel 36mmMother of pearl19mmCompatible
L2.518.4.99.2Stainless steel 36mmSilver19mmCompatible
L2.518.8.77.3Stainless steel 36mmWhite19mmCompatible
L2.518.8.77.5Stainless steel 36mmWhite19mmCompatible
L2.518.8.78.3Stainless steel 36mmWhite19mmCompatible
L2.518.8.78.5Stainless steel 36mmWhite19mmCompatible
L2.611.4.53.2Stainless steel 38mmBlack20mmCompatible
L2.619.4.53.2Stainless steel 38.5mmBlack20mmCompatible
L2.619.4.73.2Stainless steel 38.5mmWhite20mmCompatible
L2.628.4.11.6Stainless steel 38.5mmWhite20mmCompatible
L2.628.4.51.0Stainless steel 38.5mmBlack20mmCompatible
L2.628.4.51.2Stainless steel 38.5mmBlack20mmCompatible
L2.628.4.51.3Stainless steel 38.5mmBlack20mmCompatible
L2.628.4.51.4Stainless steel 38.5mmBlack20mmCompatible
L2.628.4.51.5Stainless steel 38.5mmBlack20mmCompatible
L2.628.4.51.6Stainless steel 38.5mmBlack20mmCompatible
L2.628.4.51.7Stainless steel 38.5mmBlack20mmCompatible
L2.628.4.51.8Stainless steel 38.5mmBlack20mmCompatible
L2.628.4.53.2Stainless steel 38.5mmBlack20mmCompatible
L2.628.4.53.9Stainless steel 38.5mmBlack20mmCompatible
L2.628.4.57.6Stainless steel 38.5mmBlack20mmCompatible
L2.628.4.73.2Stainless steel 38.5mmWhite20mmCompatible
L2.628.4.77.3Stainless steel 38.5mmWhite20mmCompatible
L2.628.4.77.5Stainless steel 38.5mmWhite20mmCompatible
L2.628.4.77.6Stainless steel 38.5mmWhite20mmCompatible
L2.628.4.78.0Stainless steel 38.5mmWhite20mmCompatible
L2.628.4.78.2Stainless steel 38.5mmWhite20mmCompatible
L2.628.4.78.3Stainless steel 38.5mmWhite20mmCompatible
L2.628.4.78.4Stainless steel 38.5mmWhite20mmCompatible
L2.628.4.78.5Stainless steel 38.5mmWhite20mmCompatible
L2.628.4.78.7Stainless steel 38.5mmWhite20mmCompatible
L2.628.4.78.8Stainless steel 38.5mmWhite20mmCompatible
L2.628.4.92.0Stainless steel 38.5mmBlue20mmCompatible
L2.628.4.92.6Stainless steel 38.5mmBlue20mmCompatible
L2.628.4.97.0Stainless steel 38.5mmBlue20mmCompatible
L2.628.4.97.6Stainless steel 38.5mmBlue20mmCompatible
L2.628.4.99.5Stainless steel 38.5mmWhite20mmCompatible
L2.628.6.78.0Gold 18K 38.5mmWhite20mmCompatible
L2.628.6.78.2Gold 18K 38.5mmWhite20mmCompatible
L2.628.6.78.3Gold 18K 38.5mmWhite20mmCompatible
L2.628.6.78.4Gold 18K 38.5mmWhite20mmCompatible
L2.628.6.78.5Gold 18K 38.5mmWhite20mmCompatible
L2.628.6.78.9Gold 18K 38.5mmWhite20mmCompatible
L2.628.8.77.3Rose Gold 18K 38.5mmWhite20mmCompatible
L2.628.8.77.5Rose Gold 18K 38.5mmWhite20mmCompatible
L2.628.8.78.0Rose Gold 18K 38.5mmWhite20mmCompatible
L2.628.8.78.4Rose Gold 18K 38.5mmWhite20mmCompatible
L2.628.8.78.7Rose Gold 18K 38.5mmWhite20mmCompatible
L2.629.4.51.2Stainless steel 40mmBlack21mmCompatible
L2.629.4.51.7Stainless steel 40mmBlack21mmCompatible
L2.629.4.51.8Stainless steel 40mmBlack21mmCompatible
L2.629.4.53.2Stainless steel 40mmBlack21mmCompatible
L2.629.4.58.2Stainless steel 40mmBlack21mmCompatible
L2.629.4.73.0Stainless steel 40mmWhite21mmCompatible
L2.629.4.78.6Stainless steel 40mmSilver "barleycorn"21mmCompatible
L2.629.4.78.7Stainless steel 40mmWhite21mmCompatible
L2.629.4.78.8Stainless steel 40mmWhite21mmCompatible
L2.629.4.92.0Stainless steel 40mmSunray blue21mmCompatible
L2.629.4.92.6Stainless steel 40mmBlue21mmCompatible
L2.629.4.93.2Stainless steel 40mmBlue21mmCompatible
L2.629.4.99.2Stainless steel 40mmBlue21mmCompatible
L2.631.4.51.0Stainless steel 38.5mmBlack20mmCompatible
L2.631.4.51.4Stainless steel 38.5mmBlack20mmCompatible
L2.631.4.51.6Stainless Steel 39mmBlack20mmCompatible
L2.631.4.51.7Stainless steel 38.5mmBlack20mmCompatible
L2.631.4.51.8Stainless steel 38.5mmBlack20mmCompatible
L2.631.4.51.9Stainless steel 38.5mmBlack20mmCompatible
L2.631.4.53.2Stainless steel 38.5mmBlack20mmCompatible
L2.631.4.70.0Stainless steel 38.5mmWhite20mmCompatible
L2.631.4.70.4Stainless steel 38.5mmWhite20mmCompatible
L2.631.4.70.6Stainless Steel 39mmBeige20mmCompatible
L2.631.4.70.7Stainless steel 38.5mmWhite20mmCompatible
L2.631.4.70.8Stainless steel 38.5mmWhite20mmCompatible
L2.631.4.70.9Stainless steel 38.5mmWhite20mmCompatible
L2.631.4.73.2Stainless steel 38.5mmWhite20mmCompatible
L2.631.4.75.2Stainless steel 38.5mmWhite20mmCompatible
L2.631.4.78.0Stainless steel 38.5mmWhite20mmCompatible
L2.631.4.78.4Stainless steel 38.5mmWhite20mmCompatible
L2.631.4.78.6Stainless steel 38.5mmWhite20mmCompatible
L2.631.4.78.9Stainless steel 38.5mmWhite20mmCompatible
L2.643.0.58.0Stainless steel 34.9mmGrey19mmCompatible
L2.643.0.58.1Stainless steel 34.9mmGrey19mmCompatible
L2.643.0.58.2Stainless steel 34.9mmGrey19mmCompatible
L2.643.0.58.3Stainless steel 34.9mmGrey19mmCompatible
L2.643.4.58.0Stainless steel 34.9mmGrey19mmCompatible
L2.643.4.58.1Stainless steel 34.9mmGrey19mmCompatible
L2.643.4.58.2Stainless steel 34.9mmGrey19mmCompatible
L2.643.4.58.3Stainless steel 34.9mmGrey19mmCompatible
L2.648.4.51.1Stainless steel 40mmBlack21mmCompatible
L2.648.4.51.6Stainless steel 40mmBlack21mmCompatible
L2.648.4.51.7Stainless steel 40mmBlack21mmCompatible
L2.648.4.51.8Stainless steel 40mmBlack21mmCompatible
L2.648.4.53.1Stainless steel 40mmBlack21mmCompatible
L2.648.4.53.2Stainless steel 40mmBlack21mmCompatible
L2.648.4.78.6Stainless steel 40mmWhite21mmCompatible
L2.648.4.78.7Stainless steel 40mmWhite21mmCompatible
L2.648.4.78.8Stainless steel 40mmWhite21mmCompatible
L2.656.0.53.0Stainless steel 34.9mmBlack19mmCompatible
L2.656.0.53.1Stainless steel 34.9mmBlack19mmCompatible
L2.656.0.53.2Stainless steel 34.9mmBlack19mmCompatible
L2.656.0.53.7Stainless steel 34.9mmBlack19mmCompatible
L2.656.0.71.0Stainless steel 34.9mmBeige19mmCompatible
L2.656.0.71.1Stainless steel 34.9mmBeige19mmCompatible
L2.656.0.71.2Stainless steel 34.9mmBeige19mmCompatible
L2.656.0.71.7Stainless steel 34.9mmBeige19mmCompatible
L2.665.4.51.1Stainless steel 42mmBlack21mmCompatible
L2.665.4.51.6Stainless Steel 42mmBlack21mmCompatible
L2.665.4.51.7Stainless steel 42mmBlack21mmCompatible
L2.665.4.51.8Stainless steel 42mmBlack21mmCompatible
L2.665.4.78.6Stainless Steel 42mmBeige21mmCompatible
L2.665.4.78.7Stainless steel 42mmWhite21mmCompatible
L2.666.4.51.6Stainless steel 42mmBlack21mmCompatible
L2.666.4.78.6Stainless steel 42mmWhite21mmCompatible
L2.669.4.51.0Stainless steel 38.5mmBlack20mmCompatible
L2.669.4.51.4Stainless steel 38.5mmBlack20mmCompatible
L2.669.4.51.6Stainless steel 38.5mmBlack20mmCompatible
L2.669.4.51.7Stainless steel 38.5mmBlack20mmCompatible
L2.669.4.51.8Stainless steel 38.5mmBlack20mmCompatible
L2.669.4.51.9Stainless steel 38.5mmBlack20mmCompatible
L2.669.4.78.6Stainless steel 38.5mmWhite20mmCompatible
L2.669.4.78.7Stainless steel 38.5mmWhite20mmCompatible
L2.669.4.78.8Stainless steel 38.5mmWhite20mmCompatible
L2.673.4.50.6Stainless steel 40mmBlack21mmCompatible
L2.673.4.51.6Stainless steel 40mmBlack21mmCompatible
L2.673.4.53.6Stainless steel 40mmBlack21mmCompatible
L2.673.4.59.6Stainless steel 40mmBlack21mmCompatible
L2.673.4.61.2Stainless steel 40mmAnthracite21mmCompatible
L2.673.4.61.6Stainless steel 40mmAnthracite21mmCompatible
L2.673.4.70.6Stainless steel 40mmWhite21mmCompatible
L2.673.4.71.2Stainless steel 40mmOpaline Ivory21mmCompatible
L2.673.4.71.6Stainless steel 40mmSilver21mmCompatible
L2.673.4.73.6Stainless steel 40mmWhite21mmCompatible
L2.673.4.79.6Stainless steel 40mmWhite21mmCompatible
L2.673.4.92.0Stainless steel 40mmSunray blue21mmCompatible
L2.673.4.92.6Stainless steel 40mmSunray blue21mmCompatible
L2.673.4.93.6Stainless steel 40mmBlack21mmCompatible
L2.673.4.98.6Stainless steel 40mmBlack21mmCompatible
L2.676.4.51.6Stainless steel 40mmBlack21mmCompatible
L2.676.4.78.6Stainless steel 40mmWhite21mmCompatible
L2.686.4.73.2Stainless steel 41mmWhite20mmCompatible
L2.693.4.51.1Stainless steel 44mmBlack22mmCompatible
L2.693.4.51.2Stainless steel 44mmBlack22mmCompatible
L2.693.4.51.3Stainless steel 44mmBlack22mmCompatible
L2.693.4.51.5Stainless steel 44mmBlack22mmCompatible
L2.693.4.51.6Stainless steel 44mmBlack22mmCompatible
L2.693.4.51.7Stainless steel 44mmBlack22mmCompatible
L2.693.4.51.8Stainless steel 44mmBlack22mmCompatible
L2.693.4.78.2Stainless steel 44mmWhite22mmCompatible
L2.693.4.78.3Stainless steel 44mmWhite22mmCompatible
L2.693.4.78.5Stainless steel 44mmWhite22mmCompatible
L2.693.4.78.6Stainless steel 44mmWhite22mmCompatible
L2.693.4.78.7Stainless steel 44mmWhite22mmCompatible
L2.693.4.78.8Stainless steel 44mmWhite22mmCompatible
L2.693.4.79.0Stainless steel 44mmWhite22mmCompatible
L2.704.4.56.0Stainless steel 44mmBlack22mmCompatible
L2.704.4.56.3Stainless steel 44mmBlack22mmCompatible
L2.707.4.56.0Stainless steel 36mmBlack20mmCompatible
L2.707.4.56.3Stainless steel 36mmBlack20mmCompatible
L2.708.4.51.6Stainless Steel 39mmBlack20mmCompatible
L2.708.4.51.7Stainless steel 38.5mmBlack20mmCompatible
L2.708.4.78.6Stainless Steel 39mmSilver20mmCompatible
L2.714.4.71.6Stainless steel 41mmBeige20mmCompatible
L2.714.4.78.6Stainless steel 41mmBeige20mmCompatible
L2.715.4.71.6Stainless steel 41mmBeige20mmCompatible
L2.715.4.78.6Stainless steel 41mmBeige20mmCompatible
L2.716.4.71.3Stainless steel 44mmBeige22mmCompatible
L2.716.4.71.5Stainless steel 44mmBeige22mmCompatible
L2.716.4.71.6Stainless steel 44mmBeige22mmCompatible
L2.716.4.78.2Stainless steel 44mmBeige22mmCompatible
L2.716.4.78.3Stainless steel 44mmBeige22mmCompatible
L2.716.4.78.5Stainless steel 44mmBeige22mmCompatible
L2.716.4.78.6Stainless steel 44mmBeige22mmCompatible
L2.716.4.78.7Stainless steel 44mmBeige22mmCompatible
L2.716.4.78.8Stainless steel 44mmBeige22mmCompatible
L2.716.8.78.2Rose Gold 18K 44mmBeige22mmCompatible
L2.716.8.78.3Rose Gold 18K 44mmBeige22mmCompatible
L2.716.8.78.5Rose Gold 18K 44mmBeige22mmCompatible
L2.717.4.71.3Stainless steel 44mmBeige22mmCompatible
L2.717.4.71.5Stainless steel 44mmBeige22mmCompatible
L2.717.4.71.6Stainless steel 44mmBeige22mmCompatible
L2.717.4.78.2Stainless steel 44mmBeige22mmCompatible
L2.717.4.78.3Stainless steel 44mmBeige22mmCompatible
L2.717.4.78.5Stainless steel 44mmBeige22mmCompatible
L2.717.4.78.6Stainless steel 44mmBeige22mmCompatible
L2.717.4.78.7Stainless steel 44mmBeige22mmCompatible
L2.717.4.78.8Stainless steel 44mmBeige22mmCompatible
L2.717.8.78.2Rose Gold 18K 44mmBeige22mmCompatible
L2.717.8.78.3Rose Gold 18K 44mmBeige22mmCompatible
L2.717.8.78.5Rose Gold 18K 44mmBeige22mmCompatible
L2.718.4.50.6Stainless Steel 42mmBlack21mmCompatible
L2.718.4.51.6Stainless steel 42mmBlack21mmCompatible
L2.718.4.70.6Stainless Steel 42mmSilver21mmCompatible
L2.718.4.78.6Stainless steel 42mmWhite21mmCompatible
L2.732.4.76.3Stainless steel 38.5mmWhite19mmCompatible
L2.738.4.51.6Stainless steel 41mmBlack20mmCompatible
L2.738.4.71.6Stainless steel 41mmWhite20mmCompatible
L2.739.4.51.6Stainless steel 44mmWhite22mmCompatible
L2.739.4.51.7Stainless steel 44mmWhite22mmCompatible
L2.739.4.51.8Stainless steel 44mmWhite22mmCompatible
L2.739.4.71.6Stainless steel 44mmWhite22mmCompatible
L2.742.4.02.2Stainless steel 39mmBeige19mmCompatible
L2.742.4.02.4Stainless steel 39mmBeige19mmCompatible
L2.755.4.51.6Stainless Steel 38.50mmBlack20mmCompatible
L2.755.4.77.6Stainless Steel 38.50mmSilver20mmCompatible
L2.755.4.78.6Stainless Steel 38.50mmSilver20mmCompatible
L2.758.4.51.6Stainless steel 38.5mmBlack20mmCompatible
L2.758.4.78.6Stainless steel 38.5mmBeige20mmCompatible
L2.759.4.51.6Stainless steel 42mmBlack21mmCompatible
L2.759.4.69.2Stainless steel 42mmBeige21mmCompatible
L2.759.4.78.6Stainless steel 42mmSilver "barleycorn"21mmCompatible
L2.759.4.92.0Stainless steel 42mmBlue21mmCompatible
L2.759.4.92.2Stainless steel 42mmBlue21mmCompatible
L2.759.4.92.6Stainless steel 42mmSunray blue21mmCompatible
L2.764.4.53.3Stainless steel 44mmBlack22mmCompatible
L2.764.4.53.4Stainless steel 44mmBlack22mmCompatible
L2.773.4.51.6Stainless steel 42mmBlack21mmCompatible
L2.773.4.61.2Stainless steel 42mmAnthracite21mmCompatible
L2.773.4.61.6Stainless steel 42mmAnthracite21mmCompatible
L2.773.4.71.2Stainless steel 42mmSilver21mmCompatible
L2.773.4.71.6Stainless steel 42mmSilver21mmCompatible
L2.773.4.78.6Stainless steel 42mmSilver "barleycorn"21mmCompatible
L2.773.4.92.0Stainless steel 42mmSunray blue21mmCompatible
L2.773.4.92.2Stainless steel 42mmBlue21mmCompatible
L2.773.4.92.6Stainless steel 42mmBlue21mmCompatible
L2.773.5.78.3Stainless steel 42mmWhite21mmCompatible
L2.777.4.53.0Stainless steel 41mmBlack22mmCompatible
L2.777.4.53.2Stainless steel 41mmBlack22mmCompatible
L2.778.4.53.0Stainless steel 41mmBlack22mmCompatible
L2.778.4.53.2Stainless steel 41mmBlack22mmCompatible
L2.783.4.53.0Stainless steel 41mmBlack22mmCompatible
L2.786.4.76.3Stainless steel 41mmWhite20mmCompatible
L2.786.4.76.5Stainless steel 41mmWhite20mmCompatible
L2.786.5.76.3Stainless steel 41mmWhite20mmCompatible
L2.786.5.76.5Stainless steel 41mmWhite20mmCompatible
L2.793.4.09.2Stainless steel 40mmGreen21mmCompatible
L2.793.4.09.6Stainless steel 40mmGreen21mmCompatible
L2.793.4.51.6Stainless steel 40mmBlack21mmCompatible
L2.793.4.57.6Stainless steel 40mmBlack lacquered polished21mmCompatible
L2.793.4.59.2Acero inoxidable 40mmNegro21mmCompatible
L2.793.4.59.6Stainless steel 40mmBlack21mmCompatible
L2.793.4.71.3Stainless steel 40mmGrey21mmCompatible
L2.793.4.71.5Stainless steel 40mmGrey21mmCompatible
L2.793.4.71.6Stainless steel 40mmGrey21mmCompatible
L2.793.4.73.2Stainless steel 40mmOpaline Ivory21mmCompatible
L2.793.4.77.3Stainless steel 40mmWhite21mmCompatible
L2.793.4.77.5Stainless steel 40mmWhite21mmCompatible
L2.793.4.77.6Stainless steel 40mmSilver "barleycorn"21mmCompatible
L2.793.4.78.3Stainless steel 40mmWhite21mmCompatible
L2.793.4.78.5Stainless steel 40mmWhite21mmCompatible
L2.793.4.78.6Stainless steel 40mmSilver "barleycorn"21mmCompatible
L2.793.4.79.2Stainless steel 40mmOpaline Ivory21mmCompatible
L2.793.4.79.6Stainless steel 40mmSilver21mmCompatible
L2.793.4.92.0Stainless steel 40mmBlue21mmCompatible
L2.793.4.92.2Stainless steel 40mmBlue21mmCompatible
L2.793.4.92.6Stainless steel 40mmSunray blue21mmCompatible
L2.793.4.96.6Stainless steel 40mmBlack21mmCompatible
L2.793.4.97.0Stainless steel 40mmBlue21mmCompatible
L2.793.4.97.2Stainless steel 40mmBlue21mmCompatible
L2.793.4.97.6Stainless steel 40mmSunray blue21mmCompatible
L2.793.4.98.6Stainless steel 40mmWhite21mmCompatible
L2.793.4.99.2Stainless steel 40mmBlue21mmCompatible
L2.793.5.70.2Stainless steel 40mmSilver21mmCompatible
L2.793.5.72.2Stainless steel 40mmSilver21mmCompatible
L2.793.6.73.2Gold 18K 40mmGrey21mmCompatible
L2.793.8.73.2Gold 18K 40mmGrey21mmCompatible
L2.793.8.78.318 karat rose gold 40mmSilver "barleycorn"21mmCompatible
L2.793.8.96.3Rose Gold 18K 40mmSilver21mmCompatible
L2.793.9.77.3Gold 18K 40mmSilver21mmCompatible
L2.798.4.52.3Stainless steel 42mmBlack21mmCompatible
L2.798.4.52.5Stainless steel 42mmBlack21mmCompatible
L2.798.4.72.3Stainless steel 42mmWhite21mmCompatible
L2.798.4.72.5Stainless steel 42mmWhite21mmCompatible
L2.798.5.52.3Stainless steel 42mmBlack21mmCompatible
L2.798.5.52.5Stainless steel 42mmBlack21mmCompatible
L2.798.5.72.3Stainless steel 42mmWhite21mmCompatible
L2.798.5.72.5Stainless steel 42mmWhite21mmCompatible
L2.799.4.56.3Stainless steel 42mmBlack21mmCompatible
L2.799.4.56.5Stainless steel 42mmBlack21mmCompatible
L2.799.4.76.3Stainless steel 42mmSilver21mmCompatible
L2.799.4.76.5Stainless steel 42mmSilver21mmCompatible
L2.799.5.56.3Stainless steel 42mmBlack21mmCompatible
L2.799.5.56.5Stainless steel 42mmBlack21mmCompatible
L2.799.5.76.3Stainless steel 42mmSilver21mmCompatible
L2.799.5.76.5Stainless steel 42mmSilver21mmCompatible
L2.800.4.23.2Stainless steel 41mmWhite20mmCompatible
L2.800.4.23.4Stainless steel 41mmWhite20mmCompatible
L2.800.4.26.2Stainless steel 41mmWhite20mmCompatible
L2.800.4.26.4Stainless steel 41mmWhite20mmCompatible
L2.800.4.53.0Stainless steel 41mmBlack20mmCompatible
L2.800.4.53.3Stainless steel 41mmBlack20mmCompatible
L2.801.4.23.2Stainless steel 40mmWhite19mmCompatible
L2.801.4.23.4Stainless steel 40mmWhite19mmCompatible
L2.802.4.70.3Stainless steel 42mmWhite21mmCompatible
L2.802.4.70.5Stainless steel 42mmWhite21mmCompatible
L2.802.4.70.6Stainless Steel 42mmSilver21mmCompatible
L2.803.4.23.0Stainless steel 40mmWhite21mmCompatible
L2.803.4.23.3Stainless steel 40mmWhite21mmCompatible
L2.808.4.52.0Stainless steel 42mmBlack22mmCompatible
L2.808.4.52.3Stainless steel 42mmBlack22mmCompatible
L2.812.4.23.4Stainless steel 41mmWhite21mmCompatible
L2.812.4.53.2Acero inoxidable 41mmNegro21mmCompatible
L2.815.4.23.2Stainless steel 41mmWhite19mmCompatible
L2.815.4.23.4Stainless steel 41mmWhite19mmCompatible
L2.843.4.63.2Stainless steel 38.5mmAnthracite20mmCompatible
L2.843.4.73.2Rose Gold 18K 38.5mmSilver20mmCompatible
L2.843.4.93.2Stainless steel 38.5mmSalmon20mmCompatible
L2.844.6.71.218 karat yellow gold 40mmOpaline Ivory21mmCompatible
L2.844.8.71.2Rose Gold 18K 40mmSilver21mmCompatible
L2.859.4.51.6Stainless steel 44mmBlack22mmCompatible
L2.859.4.51.7Stainless steel 44mmBlack22mmCompatible
L2.859.4.51.8Stainless steel 44mmBlack22mmCompatible
L2.859.4.78.3Stainless steel 44mmWhite22mmCompatible
L2.859.4.78.5Stainless steel 44mmWhite22mmCompatible
L2.859.4.78.6Stainless steel 44mmSilver "barleycorn"22mmCompatible
L2.859.4.92.0Stainless steel 44mmSunray blue22mmCompatible
L2.859.4.92.2Stainless steel 44mmBlue22mmCompatible
L2.859.4.92.6Stainless steel 44mmSunray blue22mmCompatible
L2.893.4.09.2Stainless steel 42mmGreen21mmCompatible
L2.893.4.09.6Stainless steel 42mmGreen21mmCompatible
L2.893.4.51.6Stainless Steel 42mmBlack21mmCompatible
L2.893.4.57.6Stainless steel 42mmBlack lacquered polished21mmCompatible
L2.893.4.59.2Stainless steel 42mmBlack21mmCompatible
L2.893.4.59.6Stainless steel 42mmBlack21mmCompatible
L2.893.4.77.6Stainless steel 42mmSilver "barleycorn"21mmCompatible
L2.893.4.78.6Stainless steel 42mmSilver "barleycorn"21mmCompatible
L2.893.4.79.6Stainless steel 42mmOpaline Ivory21mmCompatible
L2.893.4.92.0Stainless steel 42mmBlue21mmCompatible
L2.893.4.92.2Stainless steel 42mmBlue21mmCompatible
L2.893.4.92.6Stainless steel 42mmSunray blue21mmCompatible
L2.893.4.97.0Stainless steel 42mmBlue21mmCompatible
L2.893.4.97.6Stainless steel 42mmBlue21mmCompatible
L2.908.4.51.6Stainless steel 40mmBlack21mmCompatible
L2.908.4.78.6Stainless steel 40mmBeige21mmCompatible
L2.908.4.92.0Stainless steel 40mmBlue21mmCompatible
L2.908.4.92.6Stainless steel 40mmBlue21mmCompatible
L2.909.4.51.6Stainless steel 40mmBlack21mmCompatible
L2.909.4.57.6Stainless steel 40mmBlack lacquered polished21mmCompatible
L2.909.4.77.3Stainless steel 40mmSilver "barleycorn"21mmCompatible
L2.909.4.77.6Stainless steel 40mmSilver "barleycorn"21mmCompatible
L2.909.4.78.3Stainless steel 40mmSilver "barleycorn"21mmCompatible
L2.909.4.78.6Stainless steel 40mmSilver "barleycorn"21mmCompatible
L2.909.4.92.0Stainless steel 40mmBlack21mmCompatible
L2.909.4.97.0Stainless steel 40mmBlack21mmCompatible
L2.909.4.97.6Stainless steel 40mmSunray blue21mmCompatible
L2.910.4.51.6Stainless steel 40mmBlack21mmCompatible
L2.910.4.51.7Stainless steel 40mmBlack21mmCompatible
L2.910.4.77.3Stainless steel 40mmBeige21mmCompatible
L2.910.4.77.6Stainless steel 40mmBeige21mmCompatible
L2.910.4.78.6Stainless steel 40mmBeige21mmCompatible
L2.910.4.92.0Stainless steel 40mmBlue21mmCompatible
L2.910.4.92.6Stainless steel 40mmBlue21mmCompatible
L2.919.4.51.6Stainless steel 42mmBlack21mmCompatible
L2.919.4.77.3Stainless steel 42mmBeige21mmCompatible
L2.919.4.77.6Stainless steel 42mmSilver "barleycorn"21mmCompatible
L2.919.4.78.6Stainless steel 42mmSilver "barleycorn"21mmCompatible
L2.919.4.92.0Stainless steel 42mmBlue21mmCompatible
L2.919.4.92.2Stainless steel 42mmBlue21mmCompatible
L2.919.4.92.6Stainless steel 42mmSunray blue21mmCompatible
L2.919.4.97.0Stainless steel 42mmBlue21mmCompatible
L2.919.4.97.6Stainless steel 42mmSunray blue21mmCompatible
L2.920.4.51.6Stainless steel 42mmBlack21mmCompatible
L2.920.4.51.7Stainless steel 42mmBlack21mmCompatible
L2.920.4.51.8Stainless steel 42mmBlack21mmCompatible
L2.920.4.78.3Stainless steel 42mmSilver "barleycorn"21mmCompatible
L2.920.4.78.5Stainless steel 42mmBeige21mmCompatible
L2.920.4.78.6Stainless steel 42mmSilver "barleycorn"21mmCompatible
L2.920.4.92.0Stainless steel 42mmBlue21mmCompatible
L2.920.4.92.2Stainless steel 42mmBlue21mmCompatible
L2.920.4.92.6Stainless steel 42mmBlue21mmCompatible
L2.949.4.73.2Stainless steel 39mmSilver "barleycorn"20mmCompatible
L2.949.4.73.6Stainless steel 39mmSilver "barleycorn"20mmCompatible
L2.949.4.93.2Stainless steel 39mmBlue "barleycorn"20mmCompatible
L2.949.4.93.6Stainless steel 39mmBlue "barleycorn"20mmCompatible
L2.950.4.73.2Stainless steel 41mmSilver "barleycorn"21mmCompatible
L2.950.4.73.6Stainless steel 41mmSilver "barleycorn"21mmCompatible
L2.950.4.79.2Stainless steel 41mmSilver "barleycorn"21mmCompatible
L2.950.4.79.6Stainless steel 41mmSilver "barleycorn"21mmCompatible
L2.950.4.93.2Stainless steel 41mmBlue "barleycorn"21mmCompatible
L2.950.4.93.6Stainless steel 41mmBlue "barleycorn"21mmCompatible
L4.795.4.98.2Stainless steel 38.5mmSilver19mmCompatible
L4.817.4.76.2Stainless steel 38.5mmSilver19mmCompatible
L4.817.4.79.2Stainless steel 38.5mmSilver19mmCompatible
L4.817.6.76.2Gold 18K 38.5mmSilver19mmCompatible
L4.817.8.76.2Rose Gold 18K 38.5mmSilver19mmCompatible
L4.825.4.52.0Gold plated stainless steel 40mmBeige20mmCompatible
L4.825.4.92.2Gold plated stainless steel 40mmBlack20mmCompatible
L4.826.4.52.0Gold plated stainless steel 40mmBeige20mmCompatible
L4.826.4.92.2Gold plated stainless steel 40mmBlack20mmCompatible
L4.827.4.52.0Gold plated stainless steel 40mmBeige20mmCompatible
L4.827.4.92.2Gold plated stainless steel 40mmBlack20mmCompatible
L4.828.4.92.2Gold plated stainless steel 42mmBeige21mmCompatible
L4.828.4.92.4Gold plated stainless steel 42mmBeige21mmCompatible
L2.450.4.97.6Stainless steel 34mmFrosted Blue sunray18mmCompatible
L2.450.5.87.7Stainless steel and 18 karat yellow gold cap 200 34mmWhite mother-of-pearl18mmCompatible
L2.950.4.99.2Stainless steel 41mmLight Blue "barleycorn"21mmCompatible
L2.919.4.78.3Stainless steel 42mmSilver "barleycorn"21mmCompatible
L2.409.4.87.2Stainless steel 34mmWhite mother-of-pearl18mmCompatible
L2.773.4.78.3Stainless steel 42mmSilver "barleycorn"21mmCompatible
L2.949.4.99.6Stainless steel 39mmLight Blue "barleycorn"20mmCompatible
L2.962.4.73.6Stainless steel 41mmSilver "barleycorn"21mmCompatible
L2.450.5.89.7Stainless steel and 18 karat rose gold cap 200 34mmWhite mother-of-pearl18mmCompatible
L2.950.4.99.6Stainless steel 41mmLight Blue "barleycorn"21mmCompatible
L2.793.5.72.7Stainless steel and 18 karat yellow gold cap 200 40mmOpaline Ivory21mmCompatible
L2.793.5.70.7Stainless steel and 18 karat rose gold cap 200 40mmOpaline Ivory21mmCompatible
L2.962.4.73.2Stainless steel 41mmSilver "barleycorn"21mmCompatible
L2.960.4.78.2Stainless steel 41mmIvory "barleycorn"21mmCompatible
L2.960.4.93.2Stainless steel 41mmFrosted Blue "barleycorn"21mmCompatible
L2.949.4.99.2Stainless steel 39mmLight Blue "barleycorn"20mmCompatible
L2.357.4.78.3Stainless steel 34mmSilver "barleycorn"18mmCompatible
L2.357.4.87.2Stainless steel 34mmWhite mother-of-pearl18mmCompatible
L2.409.4.78.3Stainless steel 34mmSilver "barleycorn"18mmCompatible
L2.409.5.87.7Stainless steel and 18 karat yellow gold cap 200 34mmWhite mother-of-pearl18mmCompatible
L2.759.4.78.3Stainless steel 42mmSilver "barleycorn"21mmCompatible
L2.773.8.78.3Oro rosa de 18 quilates 42mmPlateada con motivo "grano de cebada"21mmCompatible
L2.793.5.37.7Stainless steel and 18 karat yellow gold cap 200 40mmGilt21mmCompatible
L2.793.5.77.7Stainless steel and 18 karat rose gold cap 200 40mmSilver "barleycorn"21mmCompatible
L2.793.5.97.7Stainless steel and 18 karat yellow gold cap 200 40mmSilver "barleycorn"21mmCompatible
L2.893.4.78.3Stainless steel 42mmSilver "barleycorn"21mmCompatible
L2.893.5.37.7Stainless steel and 18 karat yellow gold cap 200 42mmGilt21mmCompatible
L2.893.5.77.7Stainless steel and 18 karat rose gold cap 200 42mmSilver "barleycorn"21mmCompatible
L2.893.5.97.7Stainless steel and 18 karat yellow gold cap 200 42mmSilver "barleycorn"21mmCompatible
L2.628.8.78.3Rose Gold 18K 38.5mmWhite20mmCompatible

Master Collection lug widths: 18mm / 19mm / 20mm / 21mm / 22mm

The Master Collection is Longines’ classic line of automatic dress watches, from three-hand references to moon phases, annual calendars and chronographs. Most references keep classic lugs with spring bars.
Frequently paired

Smartwatches worn with Master Collection

The most common combinations our customers wear. Find your mechanical watch and discover the right Smartlet edition.

Apple Watch
Series 0 to Ultra 4
Whoop
5.0 / MG
Garmin Forerunner
255 to 965
Samsung Galaxy Watch
Series 4 to 7
Withings ScanWatch
Light / 2 / Nova
View all brands
27 brands covered
Also compatible

Other brands

Other iconic models in the Smartlet compatibility library.

Submariner
Daytona
GMT-Master
Datejust
Yacht-Master
Sky-Dweller
Explorer
Seamaster 300m
Speedmaster
Planet Ocean
De Ville
Monaco
Carrera
Formula 1
Aquaracer
Portugieser
Navitimer
Superocean
Avenger
Black Bay
Pelagos
Ranger
Luminor
Submersible
SKX
Prospex
Presage
Khaki Field
Fifty Fathoms
Reverso
SUB 300
Spring Drive
Divers Sixty-Five
Captain Cook
Superman Heritage
El Primero
Monarch
Black Bay 58 GMT
Rolex Datejust 36
Hamilton Jazzmaster
Longines Master Collection
Blancpain Villeret
View all models
Watch brand compatibility guide

Step by step

Replace your strap
01

Replace your strap

Smartlet replaces your mechanical watch strap via the standard spring-bar system. Classic, Shadow, or Titanium. No tools required.

Connect your wearable
02

Connect your wearable

Smartlet uses a dedicated adapter or native lug pins depending on your smartwatch. The connector snaps onto the Smartlet module. Zero modification to the mechanical watch.

Wear both simultaneously
03

Wear both simultaneously

Both watches sit on the same wrist. All smartwatch sensors maintain direct skin contact and operate normally.

Questions

Frequently asked questions

  • Does Smartlet work with the Longines Master Collection?
    Yes for 500 of the 646 Longines Master Collection references in our base, on 18mm to 22mm lugs with standard spring bars. Some versions use a fitting Smartlet One cannot take, so check your exact reference in the table.
  • Will Smartlet scratch or damage my Longines Master Collection?
    No. Smartlet One replaces the strap only and makes no contact with the case or crystal. The setup is fully reversible and leaves no trace on the watch.
  • Which smartwatches can I wear with my Longines Master Collection?
    Apple Watch, Samsung Galaxy Watch, Garmin, Withings, Whoop and more. Your watch sits on top of the wrist and the smartwatch underneath, on one strap.
  • Does Smartlet damage or modify my mechanical watch?
    No. Smartlet replaces your standard watch strap using the existing spring-bar system. It makes no permanent modification to the watch case, lugs, or dial. The process is fully reversible in seconds. Your mechanical watch is unaffected and can be worn independently at any time by reinstalling its original strap. Smartlet is engineered to watchmaker tolerances and tested with the same care that goes into the watches it pairs with.