The Titanium Field Guide

Heimdallr Titanium Tuna

The Heimdallr Titanium Tuna is a current-production diver watch with a Grade 3 titanium case, finished with brushed titanium. It measures 47.0 mm across, and is water resistant to 200 m. Inside is the Seiko NH35 automatic movement, with 41 h power reserve. Complications: Date. Priced from $189 (maker storefront). Brand origin: China.

Titanium diver watchesUnder $500Microbrand
Reference–
TypeDiver
Price$189 · maker storefront
Case diameter47.0 mm
Thickness–
Lug-to-lug–
Water resistance200 m
Weight–
OriginChina
MovementAutomatic
CaliberSeiko NH35
Power reserve41 h
ComplicationsDate
TitaniumGrade 3 titanium
Surface treatmentBrushed titanium
Nickel-freeYes
Bracelet / strapTitanium
CrystalSapphire
Display backNo
DialBlack
LumeSuper-LumiNova
AvailabilityOffered
StatusCurrent; maker storefront states Grade 3 titanium
Medium confidence Verified 2026-06-23 Source: Heimdallr Maker / listing ↗
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