Written by 11:11 Watch Models

Arken Instrumentum

The Arken Instrumentum is a 40mm Grade 2 titanium dive watch featuring 300m water resistance and a custom integrated titanium bracelet.

The Arken Instrumentum represents the brand’s entry into the enthusiast watch market. Featuring a design centered entirely around Grade 2 titanium, it offers a highly cohesive integrated aesthetic, combining a rugged bead-blasted case with a clean, high-legibility dial.

Overview

Brand: Arken
Model: Instrumentum
Collection: Instrumentum
Price: £430 GBP
Website: arken.uk

Specifications

Case Diameter: 40.0mm
Thickness: 11.5mm
Lug to Lug: 46.0mm
Lug Width: Integrated
Water Resistance: 300m
Case Material: Grade 2 Titanium
Crystal: Sapphire
Strap/Bracelet: Integrated Titanium Bracelet

Design & Wearability

The Instrumentum wears extremely light on the wrist thanks to its all-titanium construction. The 40mm case features a matching integrated titanium bracelet that tapers down to the clasp. The dial relies on heavy applications of C3 and BGW9 Super-LumiNova for intense low-light visibility.

Movement & Performance

Under the dial is the Japanese Miyota 9015 automatic caliber. Operating at 28,800 vibrations per hour (4Hz), it provides a smooth sweep and 42 hours of power reserve. The case features a screw-down crown and solid caseback to secure its 300m water resistance.

Official Website

Arken Instrumentum product page

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Tags: , , , , , , Last modified: 27 May 2026
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