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 is priced well under the $1,300 median for the category. Nothing touching the skin is nickel-bearing steel, verified across the case, caseback and bracelet.

Titanium diver watchesUnder $500Microbrand
Price
$189
Titanium
Grade 3 titanium
Water resistance
200 m
Nickel-free
Yes
Type
Diver
Case diameter
47.0 mm
Origin
China
Movement
Automatic
Caliber
Seiko NH35
Power reserve
41 h
Complications
Date
Case shape
Round
Case colour
Natural / grey
Finish technology
Natural finish
Surface treatment
Brushed titanium
Caseback
Titanium
Bracelet / strap
Titanium
Crystal
Sapphire
Display back
No
Dial
Black
Dial colours
Black
Lume
Super-LumiNova
Availability
Offered
Status
Current; maker storefront states Grade 3 titanium
Not published
Reference, Thickness, Lug-to-lug, Weight, Titanium bracelet Help verify
High confidence Verified Jul 2026 Source: Heimdallr Maker / listing ↗
Facts are free to cite with a link.
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Frequently asked questions

Is the Heimdallr Titanium Tuna nickel-free?

Yes. Nothing nickel-bearing touches the skin: a Grade 3 titanium case with a titanium caseback, plus a non-steel crown and bracelet and clasp. The Titanium Field Guide marks it nickel-free for whole-watch skin contact. If your allergy is severe, confirm the contact points with the maker.

What grade of titanium is the Heimdallr Titanium Tuna?

The Heimdallr Titanium Tuna has a Grade 3 titanium case with a titanium caseback. This is confirmed against the maker spec.

What size is the Heimdallr Titanium Tuna?

It is 47.0 mm in diameter, and water resistant to 200 m.

How much does the Heimdallr Titanium Tuna cost, and is it available?

It is current-production and lists from $189.

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