Seamaster Aqua Terra 150M Automatic 42.2 Chronograph Stainless Steel / Black

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.

2812.50.37 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. Introduced in 2004. Beyond the time it carries a chronograph.

The 3301 is the plainer version of Omega's 3303, made for the steel sports models of the mid-2000s. It is the Frédéric Piguet 1285 column-wheel chronograph with less decoration. It powers 16 watches in this library. The 1285 is the thin column-wheel chronograph the [Piguet piece](/blog/the-frederic-piguet-1185-the-thin-chronograph-under-three-maisons) traces through three maisons, and the 3301 runs it at 28,800 vph with a 55-hour reserve and 33 jewels at 27 mm across, certified by the COSC, without the finishing of the [3303](/calibers/omega-3303) or the co-axial escapement of the [3313](/calibers/omega-3313). In the library it powers 6 [Aqua Terra](/brands/omega/aqua-terra) Chronographs at 42.2 mm, 6 [Speedmasters](/brands/omega/speedmaster-automatic-quartz), the Michael Schumacher editions among them, and 4 [Seamaster Diver 300M](/brands/omega/seamaster-diver-300m) chronographs at 41.5 mm. 3 are limited editions. The [3313](/calibers/omega-3313) is the co-axial version that became the standard, and the [3603](/calibers/omega-3603) the GMT derivative.

15 other watches in the library run the Omega 3301.

Omega

Speedmaster Racing Chronometer Stainless Steel / Carbon Black

3852.59.11 · 42 mm

Omega

Seamaster Aqua Terra 150M Automatic 42.2 Chronograph Stainless Steel / Red Gold / Beijing Olympics 2008

221.20.42.40.01.001 · 42.2 mm

Omega

Seamaster Aqua Terra 150M Automatic 42.2 Chronograph Stainless Steel / Silver / Bracelet

2512.30.00 · 42.2 mm

Omega

Seamaster Aqua Terra 150M Automatic 42.2 Chronograph Stainless Steel / Beijing Olympics 2008

221.10.42.40.01.001 · 42.2 mm