Seamaster Planet Ocean Chronograph Co-Axial

The Seamaster Planet Ocean Chronograph Co-Axial reference 232.30.46.51.01.001 is a large-format sports chronograph produced by Omega between 2011 and 2016. Its 45.5 mm stainless steel case houses the Calibre 9300, one of the first movements to integrate a column-wheel chronograph mechanism with Omega's Co-Axial escapement. The black dial provides strong legibility against the substantial case, keeping the watch firmly within the Planet Ocean's tradition of professional dive-watch aesthetics.

The Planet Ocean line was introduced in the mid-2000s as Omega's answer to the demand for a robust, larger-cased dive watch with modern movement technology. The addition of a chronograph variant elevated the collection further, and the arrival of the in-house Calibre 9300 around 2011 marked a significant milestone, replacing earlier chronograph ebauches with a movement developed entirely within the Swatch Group's manufacture infrastructure. Reference 232.30.46.51.01.001 was produced through the mid-2010s, representing the first generation of Planet Ocean chronographs to carry a fully integrated, manufacture Co-Axial movement. Collectors regard this reference as a transitional piece that bridges Omega's earlier reliance on modified third-party calibres and its current era of in-house manufacture.