Pre-Loved Omega Planet Ocean
Omega's modern deep-diving Seamaster with serious water resistance
The Planet Ocean is the toughest, most overtly dive-focused line within Omega's Seamaster family, with bold proportions and strong water resistance. It blends genuine tool-watch capability with the polish of a modern luxury diver.
The edit — 96 pieces
































































































Why the Planet Ocean is iconic
Introduced in 2005, the Planet Ocean revived the Seamaster 300 heritage with contemporary case sizes and a helium escape valve for saturation diving. Later models adopted Omega's Co-Axial Master Chronometer movements, certified for magnetic resistance and accuracy.
What to pay pre-owned
Pre-owned Planet Oceans in the UK average around £3,495, with older 2500-calibre models often below that and newer Master Chronometer and GMT or chronograph versions above. Box and papers, case size, metal choice and whether it carries the latest anti-magnetic movement all move the price.
Sizes & variants
Buyers look at 37.5mm, 42mm, 43.5mm and 45.5mm cases, the 600m and 8500-series generations, plus GMT, chronograph, ceramic-bezel and titanium or gold variants.
How to authenticate
- 1.Confirm the reference and serial number are correct and consistently engraved, and check them against Omega's records where possible.
- 2.Have a watchmaker verify the movement is the correct Omega Co-Axial calibre, and weigh the watch, as the steel or titanium case, bezel and bracelet should feel appropriately solid.
- 3.Examine dial and bezel printing under magnification for sharp, even text and correct fonts, ensure the box and papers match, and buy from sellers offering an authentication guarantee.
Guidance only — always buy from sellers offering an authentication guarantee.
Buying a pre-owned Omega Planet Ocean — FAQs
How water resistant is the Planet Ocean?
Most references are rated to 600 metres and include a helium escape valve, making it a genuine professional-grade diver well beyond everyday needs.
What is a Master Chronometer?
It is Omega's certification confirming the movement resists magnetic fields up to 15,000 gauss and meets strict accuracy standards, found on the newer Planet Ocean generations.
Which case size should I choose?
The 42mm and 43.5mm sizes suit most wrists, while the 45.5mm wears large; try the case size on if you can before buying pre-owned.