Which Omega Seamaster to buy: Diver 300M vs Aqua Terra vs Planet Ocean, by budget (2026)

For most people, the best Omega Seamaster is the Diver 300M: Omega's classic dive watch, 42mm, water resistant to 300 metres, with the Master Chronometer calibre 8800. Under £5,000, the Railmaster. For an everyday watch that's slimmer and dressier, the Aqua Terra.

Every watch here is sold new by Goldsmiths, a UK authorised Omega retailer. Prices are Goldsmiths' own on the date shown.

How we chose

We went through all of the Seamasters Goldsmiths has in stock, around 150 of them, and read Omega's own product pages for the case measurements: diameter, thickness and lug-to-lug (the length from tip to tip, which decides how big a watch looks on your wrist). Then we picked the best Seamaster at each budget. We earn a commission if you buy through our links, which never changes the price you pay. For Omega's other collections, including the Speedmaster, see our best Omega watches.

The Seamaster family explained

Measurements are Omega's own, from its product pages. Prices are Goldsmiths' for the version shown; the Railmaster is on a strap and the Diver 300M on rubber, the least expensive way to buy each.

• Diver 300M: the classic. Goldsmiths' description says it was first released in 1993 and has been the James Bond watch for over 25 years.
• Aqua Terra: the everyday Seamaster, with no rotating bezel. Goldsmiths' description calls it "a tribute to Omega's rich maritime heritage", inspired by luxury sailboats.
• Seamaster 300 and Railmaster: modern watches based on 1957 originals, with a vintage look.
• Planet Ocean: the heavy-duty diver, water resistant to 600 metres.

Almost every Seamaster here is a Master Chronometer, certified by METAS for accuracy and resistance to magnetism: our best Omega watches explains what that means.

The best Omega Seamaster overall: Diver 300M

If you're buying one Seamaster, make it this one. Goldsmiths' description lists a 42mm stainless steel case with a blue ceramic bezel and dial, and the calibre 8800 movement; Omega gives a power reserve of 55 hours, a thickness of 13.56mm and a lug-to-lug of 49.9mm. It's water resistant to 300 metres, so it's a real dive watch.

Best Seamaster overallOmega Seamaster Diver 300M Co-Axial O21030422003001 · 42mm · Automatic · 300 m water resistant £5,600Price at Goldsmiths, 28 October 2026 Full specsSee it at Goldsmiths

Rubber or bracelet? The same watch on a rubber strap costs less. The steel bracelet is the classic look and the one we'd choose.

Omega Seamaster Diver 300M Co-Axial O21032422003001 · 42mm · Automatic · 300 m water resistant £5,300Price at Goldsmiths, 28 October 2026 Full specsSee it at Goldsmiths

Omega Seamaster 150 watches at Goldsmiths, £3,100 to £38,100. Shop the Seamaster

The best Omega Seamaster under £5,000: Railmaster

The least expensive men's automatic Seamaster at Goldsmiths when we checked. According to Goldsmiths' description, the original Railmaster was launched in 1957 for professionals working on the railways, and today's calibre 8806 resists magnetism up to 15,000 gauss; you can see it through the sapphire case back. Omega gives the 38mm case a thickness of 12.36mm and a lug-to-lug of just 44.92mm, so it's one of the best Omegas for smaller wrists. It uses the calibre 8806 with a 55-hour power reserve, according to Omega.

Best under £5,000Omega Seamaster Railmaster O23512382006001 · 38mm · Automatic · 150 m water resistant £4,800Price at Goldsmiths, 28 October 2026 Full specsSee it at Goldsmiths

The same watch is also sold on a steel bracelet.

Omega Seamaster Railmaster O23510382006001 · 38mm · Automatic · 150 m water resistant £5,200Price at Goldsmiths, 28 October 2026 Full specsSee it at Goldsmiths

The best Omega Seamaster under £6,000

Diver 300M on rubber. At the time we checked, the Diver 300M on its rubber strap was under £6,000, and it's our pick at this budget (see above).

Aqua Terra, 38mm or 41mm. The everyday Seamaster. Goldsmiths' description mentions a new symmetrical case design and Master Chronometer movements "with extraordinary levels of magnetic resistance". The 38mm uses the calibre 8800; the 41mm the calibre 8900, with a 60-hour power reserve according to Omega. On a rubber strap, both were under £6,000 when we checked.

The best everyday Seamaster: Aqua Terra, 41mm

Goldsmiths' description lists a 41mm stainless steel case, a sun-brushed "Summer Blue" dial with a gradient finish, 150 metres of water resistance and METAS Master Chronometer certification. Omega gives it a thickness of 13.2mm and a lug-to-lug of 47.9mm, so it wears slightly smaller than the Diver.

Best everyday SeamasterOmega Seamaster Aqua Terra 150M Co-Axial Master Chronometer O22010412103005 · 41mm · Automatic · 150 m water resistant £6,200Price at Goldsmiths, 28 October 2026 Full specsSee it at Goldsmiths

38mm or 41mm? The 38mm suits wrists up to about 17cm and has the more classic proportions; the 41mm suits bigger wrists and has the calibre 8900 with its longer power reserve. Goldsmiths sells the 38mm in more colours, including green, turquoise and yellow.

The best Omega Seamaster under £7,000

Seamaster 300. Goldsmiths' description calls it the modern version of the 1957 original, which was designed for professional divers. Omega gives it the calibre 8912, a 60-hour power reserve, a thickness of 13.85mm and a lug-to-lug of 48mm.

Best vintage-style diverOmega Seamaster 300 Co-Axial Master Chronometer O23430412101001 · 41mm · Automatic · 300 m water resistant £6,700Price at Goldsmiths, 28 October 2026 Full specsSee it at Goldsmiths

Planet Ocean 39.5mm. Omega's heavy-duty diver, water resistant to 600 metres, with a ceramic bezel. Omega gives the 39.5mm a lug-to-lug of only 45.6mm but a thickness of 14.21mm: compact, but tall on the wrist. It uses the calibre 8800 with a 55-hour power reserve.

Best for serious diversOmega Seamaster Planet Ocean 600M O21530402001001 · 39.5mm · Automatic · 600 m water resistant £6,700Price at Goldsmiths, 28 October 2026 Full specsSee it at Goldsmiths

The newer 42mm Planet Ocean uses the calibre 8912 with a 60-hour power reserve, and Omega gives it 13.79mm thick, slimmer than the 39.5mm. Goldsmiths' description mentions a black ceramic bezel with a white enamel diving scale and an inner ring in Grade 5 titanium.

Omega Seamaster Planet Ocean 600M O21732422101001 · 42mm · Automatic · 600 m water resistant £7,200Price at Goldsmiths, 28 October 2026 Full specsSee it at Goldsmiths

The best Omega Seamaster under £10,000

Diver 300M Chronograph. The Diver with a stopwatch. Omega gives it the calibre 9900 with a 60-hour power reserve, and it's a big watch: 44mm, 17.2mm thick and 52.8mm lug-to-lug. Try one on before you buy.

Omega Seamaster Diver 300M Co-Axial Master O21030445103001 · 44mm · Automatic · 300 m water resistant £8,100Price at Goldsmiths, 28 October 2026 Full specsSee it at Goldsmiths

The James Bond edition. Goldsmiths' description says this Grade 2 titanium Diver 300M is identical to James Bond's watch in No Time to Die, with a "tropical" brown aluminium dial and bezel, on a titanium mesh strap.

Omega Seamaster Diver 300M James Bond 007 2020 Edition O21090422001001 · 42mm · Automatic · 300 m water resistant £9,500Price at Goldsmiths, 28 October 2026 Full specsSee it at Goldsmiths

Aqua Terra Worldtimer. For travellers: Goldsmiths' description says it shows the time anywhere in the world, with cities around the dial and a 24-hour ring for day and night, in a 43mm case with the calibre 8938.

Omega Seamaster Aqua Terra 150m Co-Axial GMT Worldtimer O22010432203001 · 43mm · Automatic · 150 m water resistant £9,400Price at Goldsmiths, 28 October 2026 Full specsSee it at Goldsmiths

The best Omega Seamaster for women

Aqua Terra, 34mm. Goldsmiths' description lists a blue wave-embossed dial, 18K Sedna™ gold hands, a 34mm steel case and the calibre 8800, certified as a Master Chronometer by METAS.

Best for womenOmega Seamaster Aqua Terra Co-Axial Master Chronometer O22010342003001 · 34mm · Automatic · 150 m water resistant £5,900Price at Goldsmiths, 28 October 2026 Full specsSee it at Goldsmiths

Aqua Terra, 28mm quartz. The least expensive Seamaster at Goldsmiths when we checked: a 28mm quartz watch with the calibre 4061, a black dial and four diamond hour markers, according to Goldsmiths' description.

Omega Seamaster Aqua Terra 150m O22010286051001 · 28mm · Quartz £3,100Price at Goldsmiths, 28 October 2026 Full specsSee it at Goldsmiths

The 30mm Aqua Terra is an automatic with the calibre 8750, in several colours.

Seamaster or something else?

If the Seamaster is beyond the budget, the TAG Heuer Aquaracer Professional 300 gives you an automatic diver with an 80-hour power reserve for less: see which TAG Heuer Aquaracer to buy. For much less again, the Longines HydroConquest: see which Longines HydroConquest to buy. Comparing with Rolex? See Omega vs Rolex.