Pre-owned Omega Seamaster Planet Ocean: UK prices and what to check
The Planet Ocean is Omega's heavier-duty dive watch, rated to 600 metres, with a bolder look than the Diver 300M. Buying one pre-owned in the UK is safest through a marketplace with escrow and authentication; below are the references, what to check on this model, and where to look.
Updated 6 Nov 2026. Watches aren't investments; prices fall as well as rise.
New vs pre-owned
Goldsmiths, 6 Nov 2026: Seamaster Planet Ocean 600M Mens 39.5mm Automatic Co-Axial
UK pre-owned price index coming soon.
References
| Ref | Made | Notes |
|---|---|---|
| 215.30.44.21.01.001 | 2016– | 43.5mm, black dial, calibre 8900 |
Why people buy it
The Planet Ocean is Omega's heavier-duty dive watch, rated to 600 metres, with a bolder look than the Diver 300M. It comes in several sizes, so it can suit a range of wrists.
What to check on a pre-owned Seamaster
- Size: 39.5mm, 43.5mm and 45.5mm models exist. Check the reference so you get the size you want.
- Bezel: one-way, with firm clicks; check the ceramic insert for chips.
- Helium valve: the crown at 10 o'clock should screw down fully.
- Weight: the steel bracelet is heavy; check stretch and the clasp.
- Water resistance: ask whether it has been pressure-tested since its last service.
- Papers: Omega warranty card or e-warranty, box and service history.
More on buying safely: our pre-owned guide.
Where to buy
Dealer links may earn us a commission; it never decides what we recommend.
Questions
How much is a pre-owned Omega Seamaster Planet Ocean in the UK?
It depends on the reference, condition, and whether it has its box and papers. We're building a UK pre-owned price index from authenticated listings; until then, compare like-for-like listings on Chrono24 and eBay's Authenticity Guarantee.
Is it safe to buy a Omega Seamaster Planet Ocean pre-owned?
It can be, if you buy from an authorised pre-owned programme, an established dealer, or a marketplace that holds your money in escrow and authenticates the watch. Check the serial against the papers, ask for service history, and never pay a stranger by bank transfer.
What should I check before buying a used Seamaster?
Size: 39.5mm, 43.5mm and 45.5mm models exist. Check the reference so you get the size you want. Bezel: one-way, with firm clicks; check the ceramic insert for chips. Helium valve: the crown at 10 o'clock should screw down fully.
Does a pre-owned Omega Seamaster Planet Ocean hold its value?
Some models have sold above their new price for long spells, but watches aren't investments: prices fall as well as rise. Buy one because you want to wear it.