lug2lug
BrowseCompareNewsCommunityMy Watches
BrowseCompareNewsCommunityMy Watches
Theme
Popular microbrands:Christopher Ward·Baltic·anOrdain·Atelier Wen·Boldr·Bremont·Dan Henry·DOXABrowse all →
Best, by the specs:Best dress watches·Diver under $5,000·Chronograph under $5,000·Sport under $5,000·GMT under $5,000·Field under $2,000·Best tool watches·Pilot under $2,000All rankings →
Glossary:Lug-to-Lug·Water Resistance·Chronograph·GMT·Automatic·LumeBrowse all →
Tools:Collection tracker·Wrist-fit calculator·What should I buy?·Value retention rankings·iPhone app
Lug2Letter
Watches worth knowing about, weekly.
Curated discoveries, founder spotlights, and the occasional deep-dive.
Now on iPhone
Download on theApp Store
TermsPrivacyCopyrightDisclosuresContactContribute

Independent reference site · not affiliated with any brand · contains affiliate links

© 2026 Lug2Lug LLC · Prices are estimates and not offers

Loading watch
Home/Browse/Cronos/Watchdives x San Martin Classic 39mm Automatic Dive Watch SN0121GA
Cronos Watchdives x San Martin Classic 39mm Automatic Dive Watch SN0121GA
Click to inspect
Ask the communityStart a discussion about the Watchdives x San Martin Classic 39mm Automatic Dive Watch SN0121GA — get takes from other collectors.Ask →
Cronos · Watchdives

Cronos Watchdives x San Martin Classic 39mm Automatic Dive Watch SN0121GA

$238in stock
Buy from CronosFind used on eBay

Case

Diameter
39mm
Thickness
12.8mm
Lug-to-lug
47mm
Material
Stainless Steel
Water resistance
300m

Crystal & dial

Crystal
Sapphire

Movement

Caliber
Seiko NH35
Type
Automatic
Hacking
No
Hand-winding
No
Complications
Time only

Seiko

Seiko's third-party supply version of the 4R35, sold to external watch brands and modders worldwide. Adds hacking and hand-winding over the 7S26 it effectively replaced. The NH35 has become the default automatic movement for watch modding and microbrand watches, thanks to its low cost, reliability, and wide availability of compatible parts including dials, hands, and cases in the Seiko-compatible format.

Watchdives collection · 35 watches

Watchdives 38mm EXD Titanium Diver Watch
Watchdives 38mm EXD Titanium Diver Watch38mm
Watchdives Land Tortoisen WD6105 Dive Watch
Watchdives Land Tortoisen WD6105 Dive Watch43.8mm
Watchdives Premier WD0017 VH31/Ronda 515 Diver Watch
Watchdives Premier WD0017 VH31/Ronda 515 Diver Watch29.5mm
Watchdives Premier WD0019 ST2130 40mm Diver Watch
Watchdives Premier WD0019 ST2130 40mm Diver Watch40mm
Watchdives PVD Coated Tuna Automatic Dive Watch
Watchdives PVD Coated Tuna Automatic Dive Watch47.5mm
Watchdives Seafarar WD5513Q 40mm VH31 Sub Diver Watch
Watchdives Seafarar WD5513Q 40mm VH31 Sub Diver Watch40mm
Watchdives Vintage 50-Fathoms NH35 Dive Watch V2
Watchdives Vintage 50-Fathoms NH35 Dive Watch V240mm
Watchdives WD0003G Guilloche Dial VH31 Men Watch
Watchdives WD0003G Guilloche Dial VH31 Men Watch36mm
Watchdives WD0006 38mm VH31 Men Watch
Watchdives WD0006 38mm VH31 Men Watch38mm
Watchdives WD0013B ETA HAQ F06.41 Men Watch
Watchdives WD0013B ETA HAQ F06.41 Men Watch45.5mm
Watchdives WD0014 Aluminum Bezel Vintage NH34 GMT Watch
Watchdives WD0014 Aluminum Bezel Vintage NH34 GMT Watch40mm
Watchdives WD007ST 39mm NTTD Dive Watch
Watchdives WD007ST 39mm NTTD Dive Watch39mm
22 more in this collection
Watchdives WD1016 37mm VH31 Explore Men Watch V3Watchdives WD1016 39mm VH31 Explore Men WatchWatchdives WD1016B 37mm Pioneer VH31 Men WatchWatchdives WD16760 NH34 Sub GMT Watch V2Watchdives WD1680Q VH31 Sub Diver Watch V2Watchdives WD1965 38mm VH31 62MAS Dive Watch V2Watchdives WD1968 PT5004/PT5000 Automatic Diver WatchWatchdives WD1969 PRO 38mm VH31 Dive WatchWatchdives WD1969B PRO 38mm VH31 Dive WatchWatchdives WD1993 40mm 6460 GMT WatchWatchdives WD50Q 50-Fathoms VH31 Dive WatchWatchdives WD50Ti Titanium 50-Fathoms NH35 Dive WatchWatchdives WD5513M 9015/90S5 Vintage Sub WatchWatchdives WD6105 Captain Willard 6105 Dive Watch CollectionWatchdives WD6105 Retro Captain Willard 6105 Dive WatchWatchdives WD6263 Vintage Racing Chronograph WatchWatchdives WD6610 37mm 9015 Automatic Explore Men WatchWatchdives WD7922 37mm VH31 WatchWatchdives x San Martin 38mm NH34 GMT Watch SN0140WWatchdives x San Martin PT5000 Titanium 39mm Dive Watch SN0121TDWatchdives x San Martin ST2130 Titanium 39mm Dive Watch SN0121TEWatchdives x San Martin Titanium 39mm Dive Watch SN0121T-GB

3 colorways

Alternatives

01The connection engine

More like this.

Islander Islander Bayport Automatic Dive Watch with Blue Wave Dial #ISL-311

Islander

Islander Bayport Automatic Dive Watch with Blue Wave Dial #ISL-311

40mm · Automatic$399

BOLDR Supply Co. Merlion 50th Anniversary

BOLDR Supply Co.

Merlion 50th Anniversary

40mm · Automatic$449

MMI Watches Turret 300M - Model: TR2-OR (MIDNIGHT BLUE) (NO DATE) (OLD RADIUM)

MMI Watches

Turret 300M - Model: TR2-OR (MIDNIGHT BLUE) (NO DATE) (OLD RADIUM)

40mm · Automatic$425

MMI Watches Turret 300m V2 Retro Model Trd 02

MMI Watches

Turret 300m V2 Retro Model Trd 02

40mm · Automatic$295

Ventus Watches Northstar

Ventus Watches

Northstar

40mm · Automatic$349

Serket Watch Co Reef Mariana

Serket Watch Co

Reef Mariana

40mm · Automatic$449

View all alternatives

02The community take

Owners talk.

“
In a nutshell

The Cronos Watchdives x San Martin Classic 39mm Automatic Dive Watch SN0121GA is an automatic watch, with a 39mm stainless steel case, 12.8mm thick, powered by the Seiko NH35 movement. Water resistance is rated to 300m, under a sapphire crystal. Manufacturer MSRP is $238.

Open the discussion

On real wrists

No shots yet. Show how it wears.

03The paper trail

04The discussion

Talk about the Cronos Watchdives x San Martin Classic 39mm Automatic Dive Watch SN0121GA.