Seamaster Aqua Terra 150M Automatic 42.2 Railmaster Chronograph / Black Alligator

In Context

At 42.2 mm it is sized to the current mainstream: 40 mm is the median across every watch measured in this catalogue. The case back is open, so the movement is visible without taking the watch apart, and the sapphire crystal will resist everything short of deliberate abuse. 150 m is genuine swimming resistance — more than the shape of this watch suggests it would need.

The movement winds itself from the motion of your wrist. 55 hours of reserve is enough to set it down on Friday evening and find it still running on Monday. At 28,800 vph the seconds hand advances 8 times a second.

2812.52.31 stands on its own in this catalogue — no other reference here shares its base number. It pairs a black dial with a stainless steel case. Beyond the time it carries a chronograph.

Omega 3205 is a self-winding, column-wheel operated chronograph based on the Piguet 1285. Contrary to its 33xx siblings, it does not feature a date windown.

2 other watches in the library run the Omega 3205.

Omega

Seamaster Aqua Terra 150M Automatic 42.2 Railmaster Chronograph / Brown Alligator

2812.52.37 · 42.2 mm

Omega

Seamaster Aqua Terra 150M Automatic 42.2 Railmaster Chronograph / Bracelet

2512.52.00 · 42.2 mm