Omega
Seamaster 300M
- Reference
- 210.30.42.20.01.010
- Movement
- automatic — 8806
- Power reserve
- 55 h
- Case material
- Stainless steel
- Diameter
- 42 mm
- Thickness
- 13.8 mm
- Lug to lug
- 49.7 mm
- Crystal
- Sapphire · AR coated
- Acquired
- 5/18/2026
dive
The Seamaster 300M is the dive watch that needs no introduction, and the 8806 is the modern Master Chronometer caliber behind it: METAS-certified, 55 hours of power reserve, and anti-magnetic to 15,000 gauss. The wave dial, ceramic bezel, and helium escape valve are all classic Seamaster. Sapphire crystal with AR coating. It is the dive watch that does everything and looks like it. 42 mm, 13.8 mm thick, 49.7 mm lug-to-lug. Acquired 2026-05-18.