The Titanium Field Guide

San Martin SN027-T3 Grade 5 Titanium Diver 43mm

The San Martin SN027-T3 Grade 5 Titanium Diver 43mm is a current-production diver watch with a Grade 5 titanium case, finished with brushed. It measures 43.0 mm across, 12.5 mm thick, 51 mm lug to lug, and is water resistant to 200 m. Inside is the Seagull ST2100 automatic movement, with 60 h power reserve. Complications: Date. Brand origin: China.

Titanium diver watchesGrade 5 titanium
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Reference–
TypeDiver
Price–
Case diameter43.0 mm
Thickness12.5 mm
Lug-to-lug51 mm
Water resistance200 m
Weight–
OriginChina
MovementAutomatic
CaliberSeagull ST2100
Power reserve60 h
ComplicationsDate
TitaniumGrade 5
Surface treatmentBrushed
Nickel-freeYes
Bracelet / strapTitanium bracelet or leather strap
CrystalSapphire, AR coated
Display backNo
DialMultiple; titanium bezel
LumeBGW9 Super-LumiNova
AvailabilityOffered
StatusCurrent
High confidence Verified 2026-06-21 Source: San Martin (maker) Maker / listing ↗
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