Seamaster Planet Ocean Chronograph

The Omega Seamaster Planet Ocean Chronograph is one of the most substantial and capable watches in the Seamaster family, combining the unmistakable presence of a professional dive watch with Omega’s sophisticated in-house Co-Axial chronograph movement.

This reference 232.30.46.51.01.001 features a commanding 45.5mm stainless-steel case, black dial, black ceramic diving bezel, and stainless-steel bracelet. The bracelet includes Omega’s folding clasp with diver extension and fits up to approximately 7¾" with the diver extension closed and approximately 8¾" with the diver extension open. The larger measurement reflects the dive-extension position rather than additional conventional bracelet sizing. Bold applied hour markers, broad-arrow hands, and contrasting chronograph registers give the watch the distinctive Planet Ocean look while providing excellent legibility.

At the heart of the watch is Omega’s automatic Co-Axial Calibre 9300, an in-house column-wheel chronograph movement visible through the sapphire display caseback. The distinctive 3 o’clock chronograph register combines elapsed hours and minutes, allowing the chronograph to be read intuitively like a second clock. Additional features include a date display, screw-down crown, helium escape valve, and Omega’s original 600-meter water-resistance rating.

With its substantial wrist presence, versatile black-and-steel configuration, and combination of serious dive-watch heritage and mechanical chronograph engineering, this Planet Ocean represents an impressive generation of Omega’s modern sports watches.

This example is accompanied by an Omega warranty card dated 2017. The card date refers to the accompanying documentation and is not presented as the watch’s production year. The original Omega presentation box is not included. Includes a Time Machine Traders branded travel case.

A timegrapher reading taken during our inspection on October 5, 2026, in the face up position, showed approximately +6 seconds/day, 322° amplitude, and 0.1 ms beat error. These readings are provided for informational purposes only and are not a guarantee of accuracy, movement condition, or future performance.

Service history is unknown unless otherwise documented. Polishing or refinishing history is unknown. Internal movement condition has not been independently inspected. Water resistance has not been tested and is not guaranteed. The serial number has been withheld from the public listing.

All photographs are of the actual watch being offered. Please review the complete photo gallery for additional details.

This watch has been authenticated by a third party prior to publishing on TimeMachineTraders.com.

TMT Stock No. TMT-325

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The watch appears lightly worn and well cared for, with light signs of careful use. Light surface marks are present on the clasp and bracelet. Please review all photographs closely, as they show the actual watch being offered and are part of the condition description.

• Omega International Warranty card (dated 2017)
• Omega Pictograms card
• Time Machine Traders branded travel case

All photographs are of the actual watch offered for sale and form part of the condition description. No generative AI has been used to alter the watch or its condition.

• The bracelet includes Omega’s folding clasp with diver extension and fits up to approximately 7¾" with the diver extension closed and approximately 8¾" with the diver extension open. The larger measurement reflects the dive-extension position rather than additional conventional bracelet sizing.
• A timegrapher reading taken during our inspection on October 5, 2026, in the face up position, showed approximately +6 seconds/day, 322° amplitude, and 0.1 ms beat error. These readings are provided for informational purposes only and are not a guarantee of accuracy, movement condition, or future performance.
• Service history is unknown unless otherwise documented. Polishing or refinishing history is unknown. Internal movement condition has not been independently inspected. Water resistance has not been tested and is not guaranteed. The serial number has been withheld from the public listing.
• All photographs are of the actual watch being offered. Please review the complete photo gallery for additional details.