Seamaster Planet Ocean 600M Co-Axial 45.5 Chronograph Stainless Steel / Orange / Bracelet

In Context

At 45.5 mm it is a large watch — well above this catalogue’s 40 mm median, and enough to dominate a narrow wrist. The case back is closed, so the movement stays out of sight, and the sapphire crystal will resist everything short of deliberate abuse. 600 m is a professional diving rating, far past any demand a wrist is likely to make of it.

The movement winds itself from the motion of your wrist. 52 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.

2218.50.00 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.

The 3313 is Omega's co-axial column-wheel chronograph, built on the Frédéric Piguet 1285 base and the successor to the 3303. It powers 122 watches in this library. 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](/calibers/omega-9300) arrived in 2011. In the library it sits under 37 [De Ville](/brands/omega/de-ville) Co-Axial Chronoscopes, 26 first-generation [Planet Ocean](/brands/omega/seamaster-planet-ocean) chronographs at 45.5 mm, 20 [Aqua Terra](/brands/omega/aqua-terra) chronographs, 17 [Constellation](/brands/omega/constellation) chronographs, 14 [Speedmaster Broad Arrows](/brands/omega/speedmaster-broad-arrow) and 3 [Railmasters](/brands/omega/railmaster). Cases run from 35 mm to 45.5 mm, with 41 mm the most common at 31 references. The [2500](/calibers/omega-2500) is the three-hand co-axial of the same generation, and the [9900](/calibers/omega-9900) the Master Chronometer chronograph that eventually replaced the line.

121 other watches in the library run the Omega 3313.

Omega

Seamaster Planet Ocean 600M Co-Axial 45.5 Chronograph Mécanique 24 Sapphires

222.28.46.50.57.005 features a bezel fully set with orange sapphires. · 45.5 mm

Omega

Seamaster Planet Ocean 600M Co-Axial 45.5 Chronograph Mécanique 20 Sapphires

222.28.46.50.57.005 · 45.5 mm

Omega

Seamaster Aqua Terra 150M Co-Axial 44 Chronograph Stainless Steel / Black / Bracelet

231.10.44.50.01.001 · 44 mm

Omega

Seamaster Planet Ocean 600M Co-Axial 45.5 Chronograph Mécanique 16 Sapphires

222.28.46.50.57.002 · 45.5 mm