Omega Seamaster 300M & Apple Watch on the same wrist

Omega Seamaster 300M & Apple Watch on the same wrist

Yes. The Omega Seamaster 300M is compatible with Smartlet One via its 19mm / 20mm / 21mm lug width. The Seamaster mounts on the outer wrist; the Apple Watch clips into the Smartlet module on the inner wrist with full skin contact and full functionality.
Explore
Forbes · CNET
|
250+ clients
|
35+ countries
|
CES 2026 · Lépine 2025
|
Patented
Compatibility guide

Omega Seamaster 300M & Apple Watch on the same wrist

Omega Seamaster 300M + Apple Watch
Yes. The Omega Seamaster 300M is compatible with Smartlet One via its 19mm / 20mm / 21mm lug width. The Seamaster mounts on the outer wrist; the Apple Watch clips into the Smartlet module on the inner wrist with full skin contact and full functionality.
Omega Seamaster 300M lug width
19mm / 20mm / 21mm
Apple Watch compatibility
Series 0 to Ultra 3
Adapter
Native 20mm connection, in every Smartlet box
Sensor accuracy
Fully maintained

Why Seamaster owners wear Apple Watch too

Liquid error (sections/compat-combo-section line 172): metafield_tag can only be used with a metafield drop

Is the Omega Seamaster 300M compatible with Apple Watch on Smartlet?

Compatible
Yes. The Omega Seamaster 300M is compatible with Smartlet One via its 19mm / 20mm / 21mm lug width. The Seamaster mounts on the outer wrist; the Apple Watch clips into the Smartlet module on the inner wrist with full skin contact and full functionality.
Omega Seamaster 300M lug width
19mm / 20mm / 21mm Supported
Standard spring-bar system
Apple Watch model
Series 0 to Ultra 3
Native 20mm connection, in every Smartlet box
Sensor accuracy
Fully maintained
Inner wrist position
Reversible
In seconds
No modification to the watch

Related compatibility guides

Model guide
Omega Seamaster 300M
→
Brand guide
All Omega models
→
Smartwatch guide
Apple Watch compatibility
→

More ways to wear Smartlet

Omega Seamaster + Whoop
Omega Seamaster 300M
→
Omega Speedmaster + Apple Watch
Omega Speedmaster
→
Rolex Datejust + Apple Watch
Rolex Datejust
→

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

  • Which Seamaster 300M references work with Smartlet?
    References across 19mm / 20mm / 21mm lug widths are covered via the standard spring-bar system. The Seamaster 300M model guide lists every reference with its material, dial, and lug width.
  • Can I swim with the Seamaster and Apple Watch on Smartlet?
    Both watches keep their own water resistance. Smartlet's mounting system is unaffected by water; rinse with fresh water after sea use, as you would with any bracelet.
  • Does the helium escape valve or bezel get obstructed?
    No. Smartlet replaces only the strap. The case, bezel, crown, and valve remain completely clear and usable.
  • 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.