1952 — The order
857/52
In 1952, an Admiralty order formally established the Royal Navy Clearance Diving Branch.
The branch
An instruction that shaped one of the most demanding and disciplined roles in naval service.
The 1950s–60s
The MilSub years
Royal Navy divers of the era were issued military Submariner watches — built for absolute reliability under pressure.
Today
857/52 — both a tribute and a continuation.
The watch
TENET 857/52
Clearance Diver 200m
- Brushed steel case
- Matte anti-reflective dial
- 200 m / 660 ft water resistance
- Swiss-made mechanical movement
- Grey NATO strap
Swiss made
Founder portrait
Awaiting photography
The founder
Created by a former Royal Navy clearance diver
Simon West spent his service where the work is measured, not talked about — in the water, under pressure, on the clock.
The 857/52 carries that standard forward: traditional Swiss watchmaking built to the practical demands of professional diving equipment — discipline, functionality, and understated strength.
Simon West — Founder
Demanding & Disciplined
Purposeful & Durable
Function & Understated strength
The lineup
3334/SW — Supervisor's Watch
The second reference. Named after Article 3334 of the Royal Navy diving manual — the supervisor's watch to the 857/52's diver. Swiss-made automatic, production-ready.
Meet the Supervisor's WatchThe Journal
Stories from the branch
Admiralty Order 857/52, Article 3334 of the Navy's diving manual, and the men who wore the watches — the history our references are named after.
Read the JournalFirst batch
Join the first batch
The 857/52 will be built in small numbers.
Leave your details and a line about yourself — you'll hear about the launch before anyone else.