Omega Seamaster 600 Ploprof MKI

The Omega Seamaster 600 “PloProf” wasn’t designed for the general public — it was engineered as a weapon for saturation divers. Born from Omega’s partnership with COMEX in the late 60s, the first-series PloProf Ref. 166.077 was a radical answer to a brutal problem: create a watch that could survive depths and pressures that destroyed anything else on the market. Omega didn’t iterate; they over-built. A monobloc case machined from a single block of steel, a locking bezel system, and a visual identity so extreme that it instantly became the icon of professional dive design.

This early 1971 example has all the traits connoisseurs chase. The MK1 ( second execution) dial with its correct typography and tritium plots; the MK1 Bakelite bezel with the original locking system; and the first-type case, instantly identifiable by the absence of crown cutouts — pure, uncompromised early production architecture. The Caliber 1002 powers the piece with the reliability expected from Omega’s golden mechanical era. Paired with the proper steel 1162/162 band, the watch remains unapologetically tool-focused yet visually explosive.

A first-series PloProf is not a dive watch. It’s a statement of intent — a reminder of when brands innovated under pressure, not marketing.