Omega makes three different dive watches under the Seamaster name. They share a family name and a Master Chronometer movement, and differ in depth rating, design and character. This comparison explains which is which.
The three in brief
| Seamaster Diver 300M | Seamaster Planet Ocean 600M | Seamaster 300 | |
|---|---|---|---|
| Since | 1993 | 2005 | Heritage design after the Seamaster 300 of 1957 |
| Water resistance | 300 m | 600 m | 300 m |
| Movement | Master Chronometer caliber 8800 | Master Chronometer caliber 8900 | Master Chronometer caliber 8912 |
| Character | Modern classic: wave dial, helium valve | Professional, larger, deeper rated | Vintage-inspired, clean and slim |
Specifications vary by version; check the listing for the exact model.
Seamaster Diver 300M
The Diver 300M has been made since 1993 and is the best known of the three, with its wave-pattern dial and helium escape valve. Modern versions use the Master Chronometer caliber 8800. It sits between heritage and modern in style, and suits most wrists. Our Diver 300M vs Aqua Terra comparison helps if you are also considering a non-diver.
Seamaster Planet Ocean 600M
Omega launched the Planet Ocean in 2005. It is the professional instrument of the three: water resistant to 600 meters, larger and bolder, with the Master Chronometer caliber 8900. Choose it if you want maximum capability and don't mind a bigger watch.
Seamaster 300
The Seamaster 300 follows the original Seamaster 300 of 1957: a clean dial, a slim case and a vintage look, with the Master Chronometer caliber 8912 and 300 meters of water resistance. It is the choice for buyers who prefer understatement.
Which one should you buy?
- Diver 300M if you want the classic modern Omega diver.
- Planet Ocean if you want the deepest rating and a bold, professional watch.
- Seamaster 300 if you prefer a vintage-inspired, slimmer diver.
All three are Master Chronometers, tested for precision and resistance to magnetism. Our Omega Seamaster buying guide covers the rest of the family.
Every watch we sell is checked by our specialist before it ships, and the listing says what comes with it. We are an independent retailer, not an authorized dealer of the brands we sell.
Shop the Diver 300M, the Planet Ocean, the Seamaster 300, or all Seamaster watches.
Frequently asked questions
What is the difference between the Planet Ocean and the Diver 300M?
The Planet Ocean is rated to 600 meters, is larger and uses the caliber 8900. The Diver 300M is rated to 300 meters and uses the caliber 8800.
When was the Planet Ocean introduced?
In 2005.
Is the Seamaster 300 a reissue?
It follows the design of the original Seamaster 300 of 1957, with a modern Master Chronometer movement.
Which Omega diver is best for everyday wear?
The Diver 300M or the Seamaster 300 suit most wrists; the Planet Ocean is the larger, more professional choice.
