The Titanium Field Guide

Proxima MM300 Titanium

The Proxima MM300 Titanium is a current-production diver watch with a Grade 5 titanium case, finished with brushed titanium monoblock. It measures 44.0 mm across, 15.8 mm thick, and is water resistant to 300 m. Inside is the Seiko NH35 automatic movement, with 41 h power reserve. Complications: Date. Priced from $335 (maker storefront; final batch). Brand origin: China.

Titanium diver watchesUnder $500MicrobrandGrade 5 titanium
Reference–
TypeDiver
Price$335 · maker storefront; final batch
Case diameter44.0 mm
Thickness15.8 mm
Lug-to-lug–
Water resistance300 m
Weight–
OriginChina
MovementAutomatic
CaliberSeiko NH35
Power reserve41 h
ComplicationsDate
TitaniumGrade 5
Surface treatmentBrushed titanium monoblock
Nickel-freeYes
Bracelet / strapTitanium
CrystalSapphire
Display backNo
DialBlack
LumeSuper-LumiNova
AvailabilityOffered
StatusCurrent; final production batch; maker states Grade 5 titanium
Medium confidence Verified 2026-06-23 Source: Proxima Maker / listing ↗
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