Heimdallr Titanium Tuna

Heimdallr is a Chinese brand that sells direct, and its Titanium Tuna takes the shape of Seiko's shrouded Tuna diver, the tuna can, and makes it in Grade 3 titanium, caseback included. At 47 mm across it is a big watch, as the original is, with the shroud around a unidirectional bezel and 200 m of water resistance. The crystal is sapphire and the movement is a Hangzhou 2565A automatic with a date. It comes on a titanium bracelet, and Heimdallr lists every skin-contact part as titanium, so the guide marks it nickel-free. It sells direct for $189, shipped from the factory in China or from overseas warehouses.

Written 28 September 2026 from Heimdallr's product page.