Omega Seamaster PloProf

The PloProf is not a design, it is an engineering answer. Built in 1970 for professional saturation divers, its monobloc case has no caseback — the movement enters from the front, so there is one fewer seal to fail at depth. The crown sits at nine, the bezel locks with a red pusher, and the case measures 55mm because nothing smaller would survive. Rated to 1200 metres.

Reference: 227.32.55.21.03.001
Movement: Automatic, Co-Axial Master Chronometer calibre
Power reserve: approx. 55 hours
Case: Stainless steel monobloc, 55 mm
Water resistance: 1200 m
Year: 2026 — Full set