Wear a smartwatch with your Seiko

Wear a smartwatch with your Seiko

Smartlet One is compatible with all Seiko Prospex, Presage, and 5 Sports references using 18mm to 22mm lug widths, natively supported with no adapter. Installation uses the standard spring-bar system - no modification to the watch, fully reversible in seconds.
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Seiko compatibility

Wear a smartwatch with your Seiko

In short Smartlet One is compatible with all Seiko Prospex, Presage, and 5 Sports references using 18mm to 22mm lug widths, natively supported with no adapter. Installation uses the standard spring-bar system - no modification to the watch, fully reversible in seconds.

Seiko makes movements in-house across every price point - from the 7S26 in the 5 Sports to the Spring Drive calibres in Grand Seiko. The Prospex Turtle earned its affectionate name from a case shape designed around water resistance. The Presage applies urushi lacquer and enamel dial techniques from Japanese craft tradition. Seiko's range is wide enough that any collector owns at least one reference they would not replace. Smartlet One fits every Seiko with standard lugs via spring bars - no adapter, no modification.

Wear yours How it works
The problem
Choosing between health data and horological heritage every morning.
The solution
Smartlet One replaces your Seiko's strap via the standard spring-bar system and positions your smartwatch on the same wrist. Both watches run simultaneously, with no modification to the watch and full reversibility in seconds.
Brand
Seiko
Lug widths
18.0mm / 19.0mm / 20.0mm / 21.0mm / 22.0mm / 23.0mm / 24.0mm
Iconic models
4covered
Compatibility
Full range

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

4.9 (17)

Stealth. Switch in seconds, leave no trace.

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

Seiko models supported

Seiko Presage
20mm
Seiko Prospex SPB143
20mm / 21mm / 22mm
Seiko SKX Diver
22mm
Seiko Seiko 5
19mm / 20mm / 22mm

Other Seiko references

65 model families. Expand any group to see variants, references, and specifications.

6105
20mm1 refs+
ReferenceMaterialDialLugSmartlet
SBDC109Stainless SteelBlack20mmCompatible
62MAS
19mm / 20mm3 refs+
ReferenceMaterialDialLugSmartlet
6217-8000Stainless SteelGrey19mmCompatible
SPB143J1Stainless SteelGrey20mmCompatible
SBDX019Stainless SteelBlack20mmCompatible
Age
20mm3 refs+
ReferenceMaterialDialLugSmartlet
7N43-0C10Stainless SteelCream Compass20mmCompatible
8M25-7000Stainless SteelBeige Compass20mmCompatible
7T34-6A00Stainless SteelGreen20mmCompatible
Alpinist
20mm5 refs+
ReferenceMaterialDialLugSmartlet
SARB017Stainless SteelGreen20mmCompatible
SBDC087Stainless SteelTurquoise20mmCompatible
SBDC091Stainless SteelBrown Sunburst20mmCompatible
SPB121Stainless SteelGreen20mmCompatible
SPB210Stainless SteelBordeaux20mmCompatible
Ananta
22mm / 23mm4 refs+
ReferenceMaterialDialLugSmartlet
SAEJ001Stainless SteelBlack23mmCompatible
SAEC013Stainless SteelBlack/Red23mmCompatible
SAEK015Stainless SteelWhite22mmCompatible
SAEK013Stainless SteelBlack22mmCompatible
Brightz
20mm / 21mm7 refs+
ReferenceMaterialDialLugSmartlet
SDGM003Stainless SteelBlue20mmCompatible
SDGM001Stainless SteelChampagne20mmCompatible
SDGZ013Stainless SteelWhite Panda21mmCompatible
SAGA197TitaniumBlack/Blue20mmCompatible
SAGZ083TitaniumBlack20mmCompatible
SAGZ095TitaniumBlack20mmCompatible
SAGZ081TitaniumSilver20mmCompatible
Business-A
19mm1 refs+
ReferenceMaterialDialLugSmartlet
8305-8000Stainless SteelBlack19mmCompatible
Calculator
20mm1 refs+
ReferenceMaterialDialLugSmartlet
C153-5009Stainless SteelSilver Lcd20mmCompatible
Canadian
18mm1 refs+
ReferenceMaterialDialLugSmartlet
CR-5-1982Stainless SteelWhite Railroad Dial18mmCompatible
Chronograph
19mm / 20mm11 refs+
ReferenceMaterialDialLugSmartlet
6138-8020Stainless SteelWhite/Black Panda20mmCompatible
6139-6002Stainless SteelYellow19mmCompatible
7016-5011Stainless SteelBlue19mmCompatible
SRQ029Stainless SteelBlack20mmCompatible
SRQ031Stainless SteelWhite20mmCompatible
SRQ037J1Stainless SteelBlack/Gold20mmCompatible
SSC813Stainless SteelWhite Panda20mmCompatible
SSC817Stainless SteelBlack Panda20mmCompatible
SSC815Stainless SteelBlue Panda20mmCompatible
SRQ035Stainless SteelWhite/Black Panda20mmCompatible
SRQ039Stainless SteelBlue Panda20mmCompatible
Credor
18mm / 19mm / 20mm7 refs+
ReferenceMaterialDialLugSmartlet
GCBR993Stainless SteelBlack Lacquer19mmCompatible
GBBD98018K Yellow GoldWhite18mmCompatible
GCBZ995Stainless SteelSilver19mmCompatible
GCC997Stainless SteelSkeleton19mmCompatible
GCAR031Stainless SteelBlack20mmCompatible
GBAR001TitaniumBlue20mmCompatible
GCBW999Stainless SteelWhite19mmCompatible
Credor-Level
19mm1 refs+
ReferenceMaterialDialLugSmartlet
SPS1000-PROTOStainless SteelWhite Lacquer19mmCompatible
Cronos
18mm1 refs+
ReferenceMaterialDialLugSmartlet
5440-7990Stainless SteelBlack18mmCompatible
Crown
18mm1 refs+
ReferenceMaterialDialLugSmartlet
14060Stainless SteelWhite18mmCompatible
Digital
18mm / 20mm2 refs+
ReferenceMaterialDialLugSmartlet
D2000-1983Stainless SteelGrey Lcd18mmCompatible
SBJG001Stainless SteelBlack Lcd20mmCompatible
Diver
19mm / 20mm / 22mm5 refs+
ReferenceMaterialDialLugSmartlet
6105-8110Stainless SteelBlack19mmCompatible
6309-7040Stainless SteelBlack22mmCompatible
7002-7000Stainless SteelBlack20mmCompatible
7548-7000Stainless SteelBlack20mmCompatible
DV-PROTO-1970Stainless SteelBlack22mmCompatible
Dolce
18mm4 refs+
ReferenceMaterialDialLugSmartlet
8F32-0120Stainless SteelSilver18mmCompatible
SADA038Stainless SteelWhite18mmCompatible
SADA013TitaniumSilver18mmCompatible
SADA043TitaniumGrey18mmCompatible
Dutch
22mm1 refs+
ReferenceMaterialDialLugSmartlet
NL-6309-1979Stainless SteelBlack Knil22mmCompatible
Fieldmaster
22mm1 refs+
ReferenceMaterialDialLugSmartlet
SBA051Stainless SteelBlack22mmCompatible
First
20mm1 refs+
ReferenceMaterialDialLugSmartlet
KIN-PROTO-1984Stainless SteelBlack20mmCompatible
Flightmaster
20mm1 refs+
ReferenceMaterialDialLugSmartlet
SNA411Stainless SteelBlack20mmCompatible
Gyro
18mm1 refs+
ReferenceMaterialDialLugSmartlet
G980-1959Stainless SteelSilver18mmCompatible
High-End
20mm2 refs+
ReferenceMaterialDialLugSmartlet
SCVS013Stainless SteelBlue Sunburst20mmCompatible
SARQ001Stainless SteelSilver20mmCompatible
Hybrid
20mm1 refs+
ReferenceMaterialDialLugSmartlet
AD-PROTO-1981Stainless SteelSilver Lcd/Analog20mmCompatible
India
19mm1 refs+
ReferenceMaterialDialLugSmartlet
IR-7009-1988Stainless SteelWhite Rr Dial19mmCompatible
Izul
22mm2 refs+
ReferenceMaterialDialLugSmartlet
SBBC001Stainless SteelBlack22mmCompatible
SBBC003Stainless SteelWhite22mmCompatible
JDM
18mm / 20mm / 22mm6 refs+
ReferenceMaterialDialLugSmartlet
SBBW001TitaniumBlue22mmCompatible
SBSA109Stainless SteelPurple Sunburst22mmCompatible
SCQL015Gold-ToneChampagne18mmCompatible
SCQL009Stainless SteelWhite18mmCompatible
SNZG15J1-KJMStainless SteelBlack/Orange22mmCompatible
SZSB021Stainless SteelKhaki Green20mmCompatible
Kinetic
18mm / 20mm / 21mm / 22mm12 refs+
ReferenceMaterialDialLugSmartlet
5J22-0A40Stainless SteelBlack20mmCompatible
5J22-0D90Stainless SteelBlue20mmCompatible
7L22-0AD0Stainless SteelBlack21mmCompatible
5D44-0AA0Stainless SteelSilver Open20mmCompatible
SKA369Stainless SteelBlack22mmCompatible
SKA371Stainless SteelBlack22mmCompatible
3M21-6000Stainless SteelWhite18mmCompatible
SKA521Stainless SteelBlack22mmCompatible
SUN019Stainless SteelBlack/Blue22mmCompatible
SUN065Stainless SteelBlue/Orange22mmCompatible
SKA781Stainless SteelBlack20mmCompatible
SNP001Stainless SteelBlack20mmCompatible
King
19mm / 22mm7 refs+
ReferenceMaterialDialLugSmartlet
SRPE33Stainless SteelBlue Manta22mmCompatible
44-9990Stainless SteelSilver19mmCompatible
45-7001Stainless SteelSilver19mmCompatible
5626-7110Stainless SteelBlack19mmCompatible
SPB279Stainless SteelSilver19mmCompatible
SPB291Stainless SteelBlue19mmCompatible
SRPE03Stainless SteelBlack22mmCompatible
LCD
18mm / 20mm3 refs+
ReferenceMaterialDialLugSmartlet
A158-5019Gold-ToneChampagne Lcd18mmCompatible
A159-5000Stainless SteelSilver Lcd18mmCompatible
LCD-PROTO-1974Stainless SteelAmber Lcd20mmCompatible
Lady
18mm / 20mm2 refs+
ReferenceMaterialDialLugSmartlet
SRPE80Stainless SteelRose Gold18mmCompatible
SRPH81Stainless SteelPink20mmCompatible
Landmaster
20mm1 refs+
ReferenceMaterialDialLugSmartlet
7K52-6A00Stainless SteelChampagne20mmCompatible
Leopard
18mm1 refs+
ReferenceMaterialDialLugSmartlet
2205-0760Stainless SteelGreen18mmCompatible
Lord
19mm3 refs+
ReferenceMaterialDialLugSmartlet
5740-8000Stainless SteelSilver19mmCompatible
5740-8000-BStainless SteelBlack19mmCompatible
5606-7000Stainless SteelSilver19mmCompatible
MarineMaster
20mm3 refs+
ReferenceMaterialDialLugSmartlet
SBDC061Stainless SteelBlack20mmCompatible
SBDX001Stainless SteelBlack20mmCompatible
SBDX017Stainless SteelBlack20mmCompatible
Marvel
18mm1 refs+
ReferenceMaterialDialLugSmartlet
14025Stainless SteelSilver18mmCompatible
Mexico
22mm1 refs+
ReferenceMaterialDialLugSmartlet
SRPE45-MXStainless SteelGreen Sunburst22mmCompatible
Oman
20mm / 22mm2 refs+
ReferenceMaterialDialLugSmartlet
Khanjar-6309Stainless SteelBlack Khanjar22mmCompatible
Khanjar-7002Stainless SteelBlack/Red Emblem20mmCompatible
Premier
20mm10 refs+
ReferenceMaterialDialLugSmartlet
SPC131GGold-ToneWhite Roman20mmCompatible
SPC131Stainless SteelWhite Roman20mmCompatible
SSA346Stainless SteelBlue Open20mmCompatible
SSA345J1Stainless SteelSilver20mmCompatible
SSA347J1Stainless SteelBlue20mmCompatible
SNP001Stainless SteelBlack Roman20mmCompatible
SNP023Stainless SteelWhite Roman20mmCompatible
SRX003Stainless SteelBlack20mmCompatible
SRX017Stainless SteelSilver20mmCompatible
SRX015Stainless SteelBlack20mmCompatible
Presmatic
19mm1 refs+
ReferenceMaterialDialLugSmartlet
5146-7000Stainless SteelSilver19mmCompatible
Prospex
20mm / 21mm / 22mm17 refs+
ReferenceMaterialDialLugSmartlet
SRP777Stainless SteelBlack22mmCompatible
SRP773Stainless SteelBlue22mmCompatible
SRPB51Stainless SteelGrey22mmCompatible
SRPB49Stainless SteelBlue22mmCompatible
SPB101Stainless SteelBlack20mmCompatible
SPB103Stainless SteelBlue20mmCompatible
SPB143Stainless SteelGrey20mmCompatible
SPB147Stainless SteelBrown20mmCompatible
SPB151Stainless SteelBlack20mmCompatible
SPB153Stainless SteelGreen20mmCompatible
SBDB025TitaniumBlue22mmCompatible
SBDB021TitaniumBlack22mmCompatible
SRPA21Stainless SteelBlue/Red22mmCompatible
SNE435Stainless SteelBlue20mmCompatible
SSC009Stainless SteelBlack21mmCompatible
SRPC93Stainless SteelBlue Gradient22mmCompatible
SRPC91Stainless SteelBlue Gradient22mmCompatible
Prototype
20mm1 refs+
ReferenceMaterialDialLugSmartlet
Proto-Skel-1991Stainless SteelOpenworked20mmCompatible
Quartz
18mm / 19mm / 20mm5 refs+
ReferenceMaterialDialLugSmartlet
3823-7000Stainless SteelSilver18mmCompatible
7A28-703BStainless SteelBlack18mmCompatible
8223-5050Gold-ToneChampagne18mmCompatible
8228-5020Stainless SteelBlue20mmCompatible
0903-8000Stainless SteelBlue19mmCompatible
SKX007
22mm1 refs+
ReferenceMaterialDialLugSmartlet
Divers SKX007Stainless SteelBlack22mmCompatible
SKX009
22mm1 refs+
ReferenceMaterialDialLugSmartlet
Divers SKX009Stainless SteelBlue/Red22mmCompatible
Sakura
20mm2 refs+
ReferenceMaterialDialLugSmartlet
SRP853J1Stainless SteelWhite Sakura20mmCompatible
SRPC97J1Stainless SteelPink Sakura20mmCompatible
Seiko
18mm / 19mm / 20mm16 refs+
ReferenceMaterialDialLugSmartlet
7019-7070Stainless SteelBlue19mmCompatible
Proto-AD-1982Stainless SteelHybrid Lcd20mmCompatible
8223-5150Gold-ToneChampagne18mmCompatible
SGF204Stainless SteelSilver18mmCompatible
SPB241Stainless SteelCream20mmCompatible
SK-1971Stainless SteelSilver19mmCompatible
Proto-Myst-1972Stainless SteelBlack Rotating Disc19mmCompatible
SBCM023Stainless SteelBlack20mmCompatible
SBCM025TitaniumBlue20mmCompatible
Laurel-1951Stainless SteelWhite18mmCompatible
14060Stainless SteelSilver18mmCompatible
SNP005Stainless SteelBlack20mmCompatible
SNP023Stainless SteelWhite Roman20mmCompatible
V.F.A. 4883-8010Stainless SteelSilver19mmCompatible
7546-6040Stainless SteelSilver20mmCompatible
Proto-330-1962Stainless SteelSilver19mmCompatible
Seikomatic
19mm2 refs+
ReferenceMaterialDialLugSmartlet
6246-9001Stainless SteelSilver19mmCompatible
6218-8970Stainless SteelSilver19mmCompatible
Seikomatic-P
19mm1 refs+
ReferenceMaterialDialLugSmartlet
5106-7000Stainless SteelSilver19mmCompatible
Selection
20mm2 refs+
ReferenceMaterialDialLugSmartlet
SBPX099Stainless SteelBlue20mmCompatible
SBPY115Stainless SteelBlack20mmCompatible

Seiko lug widths:

18mm19mm20mm21mm22mm23mm24mm
Frequently paired

Smartwatches worn with Seiko

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

Apple Watch
Series 0 to Ultra 3
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

Smartlet One covers 18mm to 24mm lug widths across the finest watch brands.

Rolex
Omega
Tag Heuer
Breitling
Tudor
IWC
Longines
Hamilton
Grand Seiko
Bell&Ross
Blancpain
Panerai
Cartier
Jaeger Lecoultre
Zenith
Rado
Tissot
Oris
Doxa
Formex
Timex
Sinn
Porsche Design
Mido
Yema
Christopher Ward
View all
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 Seiko watches?
    Yes. Seiko references from 19mm to 22mm lug width are natively supported by Smartlet One.
  • Which Seiko models have guides?
    Prospex SPB143, Presage, SKX Diver, and Seiko 5 each have a full compatibility guide.
  • Will Smartlet affect my Seiko movement?
    No. Smartlet attaches via the spring-bar slots only. The movement and case seals are unaffected.
  • 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.