Omega Seamaster Diver 300 M

The helium escape valve at ten o'clock is not decoration. During saturation diving, helium works its way into a watch case under pressure and needs a controlled route out during decompression or the crystal lifts off. Omega's version is conical and can be operated underwater. Around it sits a 42mm steel case with a polished ceramic bezel and enamel-filled diving scale, and inside runs the METAS-certified Calibre 8800, resistant to 15,000 gauss.

Reference: 210.30.42.20.04.002
Movement: Automatic, Co-Axial Master Chronometer Calibre 8800
Power reserve: approx. 55 hours
Case: Stainless steel, 42 mm
Water resistance: 300 m
Year: 2026 — Full set