Watch reference library
Omega Seamaster Planet Ocean 600M 215.30.44.21.01.001 “PO”
In production 2016 to present.
Specifications
- Case size
- 43.5mm, 16.1mm thick
- Case material
- Stainless steel case and bracelet
- Bezel
- Unidirectional black ceramic bezel with Liquidmetal diving scale
- Dial
- Black ceramic (ZrO2) dial with Arabic numerals, date window at 3 o'clock
- Movement
- Omega Co-Axial Master Chronometer Caliber 8900, automatic
- Power reserve
- 60 hours
- Water resistance
- 600 meters, with helium escape valve
- Crystal
- Scratch-resistant sapphire crystal
- Bracelet
- Stainless steel bracelet with patented extendable fold-over clasp
The story
The Seamaster Planet Ocean line began in 2005 as Omega's answer to a more technically capable diving watch than the Seamaster Diver 300M, rated to 600 meters and equipped with a helium escape valve, a feature associated with saturation diving. Reference 215.30.44.21.01.001 belongs to the generation Omega introduced in 2016, when the collection's three-hand models were reorganized into 39.5mm and 43.5mm case sizes, replacing the earlier 37.5mm, 42mm, and 45.5mm options. That 2016 update also brought the Co-Axial Master Chronometer caliber 8900 to the larger case size, along with a glossy zirconium oxide ceramic dial that replaced the earlier lacquered or PVD-coated dials. The caliber 8900 is a further development of the caliber 8500 used in the prior generation, adding non-magnetic components to the escapement so the finished watch can pass METAS Master Chronometer testing. Within the current Seamaster range, the Planet Ocean 600M sits above the Diver 300M in both water resistance and case size, and it continues the diving watch heritage Omega traces back to the Seamaster 300 of 1957.
What to check before you buy
Check that the case reads 43.5mm and the caseback confirms caliber 8900, since Planet Ocean references from before 2016 used the caliber 8500 and different case dimensions, and a mismatch usually means an incorrect or altered listing. The ceramic dial and bezel are durable against scratching but can chip on a hard impact, so examine the bezel edge and dial flange closely. Because the helium escape valve is a functional feature rather than decorative, confirm on a used piece that it screws down properly and has not been forced. As with other current-production Omega divers, ask for service history on watches more than five to eight years old.
Buying or selling a 215.30.44.21.01.001?
Moda is always buying. Text photos to (605) 521-2821 for a fast offer, or start on the Moda Watches page. For any deal with a stranger, Moda's middleman service inspects the watch before money changes hands.
Common questions
What is the difference between the Planet Ocean 600M and the Seamaster Diver 300M?
The Planet Ocean is rated to 600 meters versus 300 meters for the Diver, has a larger 43.5mm case, and includes a helium escape valve for saturation diving, which the Diver 300M does not have.
What movement does the current 43.5mm Planet Ocean use?
It uses the Omega Co-Axial Master Chronometer caliber 8900, a 60 hour power reserve automatic movement certified by METAS.
When was this case size and movement combination introduced?
Omega introduced the 43.5mm case with the caliber 8900 and ceramic dial in 2016, replacing the earlier 42mm and 45.5mm caliber 8500 models.
Does the Planet Ocean 600M need the helium valve for normal use?
No, it is a feature intended for saturation diving decompression, and most owners will never need to use it, but its presence and correct function are still checked when evaluating a used watch.
What is the case thickness compared to the Diver 300M?
The Planet Ocean 600M measures about 16.1mm thick, noticeably more substantial than the Diver 300M's 13.6mm, reflecting its deeper water resistance rating.