Buying an Omega Seamaster: Diver 300M, Aqua Terra, Planet Ocean and 300 Compared
Anyone looking to buy an Omega Seamaster is not simply buying a watch but choosing from an entire family: The Diver 300M, Seamaster 300, Aqua Terra, Planet Ocean, the Diver 300M Chronograph and the 007 Edition all bear the same name and yet are very different watches. We show how the lines differ, which movements power them and what they cost at HORANDO.
The Key Points at a Glance
The Diver 300M is the best-known Seamaster: A dive watch with a wave dial, helium escape valve and 300 metres of water resistance, from 5,000 euros at HORANDO.
The Seamaster 300 is the classic dive watch in the style of the 1950s: A plainer dial, 41 mm, also water-resistant to 300 metres.
The Aqua Terra is the Seamaster for every day: Without a rotating bezel, with a teak pattern on the dial and 150 metres of water resistance.
The Planet Ocean is the professional line: Water-resistant to 600 metres and noticeably more substantial.
The current models of the four core lines are certified as Master Chronometers and are therefore protected, among other things, against magnetic fields of up to 15,000 gauss.
One Line, Many Watches
Omega has used the Seamaster name since 1948. What was once a robust, water-resistant everyday watch is today the brand's largest line. The dive watches began in 1957 with the Seamaster 300, which was presented together with the Speedmaster and the Railmaster. The Diver 300M followed in 1993 and has also been worn by James Bond since 1995. The Aqua Terra arrived in 2002 as a more elegant variant, the Planet Ocean in 2005 as a watch for serious divers. You can read how the connection with 007 came about in our article James Bond and Omega.
For the buying decision, however, history is secondary. Three questions matter more: Do you want a real dive watch with a rotating bezel or a watch for the office and the weekend? Which size suits your wrist? And do you need a chronograph?
Diver 300M: The Seamaster Most People Mean
Anyone searching for an Omega Seamaster ends up with the Seamaster Diver 300M in most cases. Typical features are the dial with its wave pattern, the ceramic bezel and the helium escape valve on the left side of the case. The case measures 42 mm and it is water-resistant to 300 metres. Inside works the calibre 8800 with a 55-hour power reserve, visible through the transparent caseback.
Our Diver 300M with grey dial on a rubber strap (reference 210.32.42.20.06.001) costs 5,000 euros. It is the right choice for anyone looking for a sporty watch for every day who occasionally goes into the water.
Seamaster 300 or Diver 300M: The Difference
Both are water-resistant to 300 metres, both have a rotating bezel. The difference lies in their character. The Seamaster 300 takes up the design of the first diving Seamaster from 1957: A plain black dial, broad hands, no helium escape valve, no wave pattern. At 41 mm it is slightly smaller. Inside works the calibre 8912 with a 60-hour power reserve.
Our rule of thumb: If you want a modern, eye-catching dive watch, choose the Diver 300M. If you prefer something more understated and classic, choose the Seamaster 300. The Seamaster 300 in steel with a black dial (reference 234.30.41.21.01.001) costs 6,310 euros at HORANDO.
Aqua Terra: The Seamaster for the Office and the Weekend
The Aqua Terra is the Seamaster for everyone who does not need a dive watch. It has no rotating bezel, but instead a dial with horizontal stripes reminiscent of the wooden decks of sailing boats. It fits under a shirt cuff and, with 150 metres of water resistance, remains a watch you can go swimming with.
The Aqua Terra 150M in 41 mm with a black dial (reference 220.10.41.21.01.002) is powered by the calibre 8900 with a 60-hour power reserve and costs 5,900 euros. Smaller Aqua Terra models start at 5,580 euros at HORANDO. The Aqua Terra is also available in 38 and 34 mm as well as a GMT Worldtimer with world time display.
Planet Ocean: For Those Who Dive Deeper
The Planet Ocean is the Seamaster for professional use. It is water-resistant to 600 metres, has a helium escape valve and looks considerably more powerful on the wrist than the Diver 300M. The Planet Ocean 600M in 42 mm (reference 217.30.42.21.01.001) costs 7,380 euros at HORANDO. We explain what makes a real dive watch in our Knowledge Thursday on dive watches.
Chronographs and 007 Editions
If you want a stopwatch function, you will find it in the Diver 300M Chronograph with 44 mm and the calibre 9900 with a 60-hour power reserve. The version in steel with a black dial and steel bracelet (reference 210.30.44.51.01.001) costs 7,630 euros at HORANDO. For Bond fans there is the Diver 300M 007 Edition: 42 mm titanium, black dial, textile strap, calibre 8806 with a 55-hour power reserve and 300 metres of water resistance. It costs 7,950 euros.
All References and Prices Compared
The prices apply at HORANDO (as of October 2026); the manufacturer's recommended retail price is shown in brackets. The delivery time is stated on each product page.
| Model | Reference | Size / Dial | Calibre | Water resistance | Price |
|---|---|---|---|---|---|
| Diver 300M | 210.32.42.20.06.001 | 42 mm / Grey, rubber | 8800, 55 h | 300 m | €5,000 (RRP €6,100) |
| Diver 300M | 210.30.42.20.01.001 | 42 mm / Steel bracelet | 8800, 55 h | 300 m | €5,330 (RRP €6,500) |
| Seamaster 300 | 234.30.41.21.01.001 | 41 mm / Black, steel bracelet | 8912, 60 h | 300 m | €6,310 (RRP €7,700) |
| Aqua Terra 150M | 220.10.41.21.01.002 | 41 mm / Black, steel bracelet | 8900, 60 h | 150 m | €5,900 (RRP €7,200) |
| Planet Ocean 600M | 217.30.42.21.01.001 | 42 mm / Black, steel bracelet | 8912, 60 h | 600 m | €7,380 (RRP €9,000) |
| Diver 300M Chronograph | 210.30.44.51.01.001 | 44 mm / Black, steel bracelet | 9900, 60 h | 300 m | €7,630 (RRP €9,300) |
| Diver 300M 007 Edition | 210.92.42.20.01.001 | 42 mm titanium / Black, textile strap | 8806, 55 h | 300 m | €7,950 (RRP €9,700) |
Which Seamaster Should You Buy?
The one sports watch for every day: Diver 300M. It is the most versatile Seamaster and the best way into the line.
For lovers of classic dive watches: Seamaster 300.
For the office and a suit: Aqua Terra.
For divers and anyone who likes it more robust: Planet Ocean.
For chronograph lovers and Bond fans: The Diver 300M Chronograph or the 007 Edition.
You can read how the Seamaster develops in value in our Seamaster value development. The article COSC and Master Chronometer explains what lies behind the Master Chronometer certification.
Frequently Asked Questions
How much does an Omega Seamaster cost?
At HORANDO the Diver 300M in steel starts at 5,000 euros, the Aqua Terra 150M at 5,580 euros, the Seamaster 300 at 6,310 euros and the Planet Ocean 600M at 7,380 euros. Chronographs and gold models cost more.
Which Omega Seamaster is the best?
For most buyers, the Diver 300M: It is robust, water-resistant to 300 metres, sporty and still suitable for everyday wear. If you do not need a dive watch, the Aqua Terra is the better choice.
What is the difference between the Seamaster 300 and the Diver 300M?
Both are water-resistant to 300 metres. The Diver 300M has a wave dial, a helium escape valve and 42 mm, the Seamaster 300 a classic design in the style of the 1950s and 41 mm.
Is the Omega Seamaster an automatic watch?
Yes, the current models of the Diver 300M, Seamaster 300, Aqua Terra and Planet Ocean are powered by automatic movements with a co-axial escapement and are certified as Master Chronometers.
Can you swim with the Aqua Terra?
Yes, the Aqua Terra is water-resistant to 150 metres. That is easily enough for swimming and snorkelling; for diving, a watch with a rotating bezel such as the Diver 300M is the better choice.
Conclusion
The Seamaster is not a single watch but a family in which almost everyone finds their watch. If you are unsure, start with the Diver 300M. If you are torn between two models, we will be happy to advise you personally – in our showroom in Bamberg, by phone or on WhatsApp. You will find all models in our selection of Omega Seamaster watches and in the complete Omega range.
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