Omega
Seamaster Planet Ocean Co-Axial 42
232.30.42.21.01.001
A 42 mm diver built around Omega's first in-house Co-Axial movement.
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Overview
The Seamaster Planet Ocean Co-Axial 42 (ref. 232.30.42.21.01.001) is a 42 mm stainless steel dive watch produced by Omega between 2011 and 2016. It is powered by Calibre 8500, the manufacture's landmark in-house Co-Axial movement, and wears a black dial that has become a defining look for the Planet Ocean line. As a member of the long-running Seamaster family, it balances professional diving capability with the refined finishing expected of a Swiss manufacture piece.
History
The Planet Ocean line was introduced in the mid-2000s as Omega's answer to a serious, tool-oriented dive watch sitting above the Seamaster Diver 300M in the collection hierarchy. The 42 mm case size was among the first Planet Ocean formats offered and remained a cornerstone of the range throughout its production. Calibre 8500, introduced around 2007, represented a pivotal moment for Omega as it marked the brand's return to fully in-house movement manufacture after decades of relying on ébauche suppliers. The reference 232.30.42.21.01.001 was produced through the mid-2010s, making it a representative example of the Planet Ocean's mature first generation.
Notable points
- Calibre 8500 features a Co-Axial escapement, twin mainspring barrels for an extended power reserve, and a free-sprung balance — all developed entirely in-house by Omega.
- The 42 mm stainless steel case offers water resistance suited to professional diving standards, with a helium escape valve and a unidirectional rotating bezel.
- The black dial variant is the most iconic Planet Ocean configuration, pairing high-legibility luminous indices with the model's bold, tool-watch aesthetic.
- Calibre 8500 was one of the first movements in the industry to receive COSC chronometer certification alongside Co-Axial escapement technology in a single package.
- The Planet Ocean line draws its name and spirit from the Omega-sponsored documentary series of the same name, reinforcing the model's connection to ocean exploration.
Specifications
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