Seamaster 120M Automatic 36.25 Stainless Steel / Silver

In Context

At 36.25 mm it is classically proportioned: the size a dress watch was understood to be for most of the twentieth century, and small enough to sit under a cuff. The case back is closed, so the movement stays out of sight, and the sapphire crystal will resist everything short of deliberate abuse. 120 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. 42 hours of reserve carries it overnight, but not through a weekend in a drawer. At 28,800 vph the seconds hand advances 8 times a second.

2501.31.00 stands on its own in this catalogue — no other reference here shares its base number. It pairs a silver dial with a stainless steel case.

The 1120 is the chronometer-grade automatic of the 1990s Seamaster: an ETA 2892-A2 with Omega's finishing and adjustment, certified by the COSC. It powers 92 watches in this library. The 2892 is the thin automatic base most Swiss maisons built on, and the [2892 piece](/blog/the-eta-2892) explains why. Omega's version runs at 28,800 vph with a 42-hour reserve and 23 jewels, at 25.6 mm across and 3.6 mm high, and it is the movement of the Seamaster Professional 300M from 1993 until the [Co-Axial 2500](/calibers/omega-2500) took over in 2005, including the blue-dial 2531.80 that succeeded the quartz Bond watch in the films. In the library it powers 54 [Seamaster Diver 300M](/brands/omega/seamaster-diver-300m) references, the 41 mm and the 36.25 mm mid-size, 17 [De Ville](/brands/omega/de-ville) Prestige automatics, 14 [Constellations](/brands/omega/constellation) and 7 [Seamaster 120Ms](/brands/omega/seamaster-120m). Cases run from 22.5 mm to 41 mm, with 41 mm the most common at 35 references. The [1109](/calibers/omega-1109) is the non-chronometer version of the same base, and the [1538](/calibers/omega-1538) the quartz movement the Seamaster offered beside it.

91 other watches in the library run the Omega 1120.

Omega

Seamaster Diver 300M Automatic 41 Stainless Steel / Black / Bracelet / Japan

2251.50.00 · 41 mm

Omega

Seamaster Diver 300M Automatic 36.25 Stainless Steel / Black / Bracelet / Japan

2250.50.00 · 36.25 mm

Omega

Seamaster Diver 300M Automatic 41 Stainless Steel / Electric Blue / Bracelet / Ian Thorpe

2256.80.00 · 41 mm

Omega

Seamaster Diver 300M Automatic 41 Stainless Steel / Blue / Bracelet / Japan

2251.80.00 · 41 mm