The Titanium Field Guide

San Martin Watchdives SN0121T Titanium 39mm

The San Martin Watchdives SN0121T Titanium 39mm is a current-production diver watch with a Grade 2/5 (listings vary) titanium case. It measures 39.0 mm across, 12.8 mm thick, 47 mm lug to lug, 100.5 g, and is water resistant to 300 m. Inside is the Seiko NH35 automatic movement, with ~41 h power reserve. Complications: Date. Priced from $278 (approx). Brand origin: China.

Titanium diver watchesUnder $1,000
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TypeDiver
Price$278 · approx
Case diameter39.0 mm
Thickness12.8 mm
Lug-to-lug47 mm
Water resistance300 m
Weight100.5 g
OriginChina
MovementAutomatic
CaliberSeiko NH35
Power reserve~41 h
ComplicationsDate
TitaniumGrade 2/5 (listings vary)
Surface treatmentNone; ceramic bezel
Nickel-freeYes
Bracelet / strapTitanium
CrystalSapphire, AR coated
Display backNo
DialMatte black / matte blue
LumeSuper-LumiNova BGW9
AvailabilityOffered
StatusCurrent
Medium confidence Verified 2026-06-21 Source: San Martin / Watchdives Maker / listing ↗
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