3313

About the Omega 3313

The 1285 is a compact integrated chronograph with a column wheel and a vertical clutch, and Omega fitted it with the co-axial escapement to make the 3303 in the early 2000s and then the 3313, which added a free-sprung balance. It runs at 28,800 vph with a 52-hour reserve, 36 jewels and a 30 mm diameter, is COSC-certified, and shows a date at 6 o'clock between the two counters. It was the chronograph of the co-axial era until the in-house 9300 arrived in 2011.

In the library it sits under 37 De Ville Co-Axial Chronoscopes, 26 first-generation Planet Ocean chronographs at 45.5 mm, 20 Aqua Terra chronographs, 17 Constellation chronographs, 14 Speedmaster Broad Arrows and 3 Railmasters. Cases run from 35 mm to 45.5 mm, with 41 mm the most common at 31 references.

The 2500 is the three-hand co-axial of the same generation, and the 9900 the Master Chronometer chronograph that eventually replaced the line.