History and Information of the Omega Seamaster 300

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The Omega Seamaster 300 is one of several professional divers’ watches featured in the Omega Seamaster dive watch range. Don’t confuse this Omega Seamaster 300 with the Omega Seamaster Professional Diver 300m or the Seamaster Planet Ocean. A quick glance at any of these models should be time enough to determine which model it is. If BOTH hands have arrowhead pointers – it’s an Omega Planet Ocean. If ONLY the hour hand has the arrowhead it’s the Seamaster 300featured here. The Seamaster Diver 300m is totally different with distinctive skeletal (hollow) hands. Scroll down for more information on model recognition.

An example of an Omega Seamaster 300 divers watch

Seamaster 300 – rebirth of a classic

It was 1957 when Omega introduced the Seamaster 300. Designed specifically for divers and underwater professionals. Fast forward another 50 years and Omega have kindly reintroduced the Seamaster 300. Maintaining all the aesthetic qualities of the original Omega have completely upgraded and enhanced this classic watch. Stuffed with new and innovative technical features have ensured the Seamaster 300 is here to equip the next generation of adventurers on land and in the sea.

Omega Seamaster 300 Chronometer with black leather strap, dial and bezel (left) and an Omega Seamaster 300 with steel bracelet (right).

It was 2014 when Omega released this new version of the Seamaster 300. After several years in production the new MK2 is now available in over 16 different model variants. Available with leather, steel, gold or titanium straps and an equally impressive range of case materials. All models are powered by Omega’s superb Master Coaxial Calibres 8400, 8402 and 8800

Re-birth of the classic Seamaster 300 with brown leather strap
Reborn – the Omega Seamaster Master Co-Axial 300

Presented in the perfect case size – 42mm – the Seamaster Master Co-Axial is certified to depths of 300m or a pressure of 30Bar – a true diver’s watch with no compromise and style by the bucket full.

Glowing with Super-Luminova

Large triangular numeral markers and hands all encased in super bright Super-Luminova. The all important minute hand glows a different colour to all other hands and markings to help differentiate during essential dive timing in low light conditions

Glow in the dark - the Omega Seamaster 300 with Super-Luminova
Super-Luminova coatings on hour markers, hands and bezel “0” position

Master Coaxial Movement

There’s no doubt the Seamaster impresses from the exterior – but it’s inside that the really beauty can be found. Powered by Omega’s Master Coaxial Calibres 8400, 8402 and 8800 movements (model dependent) – the Seamaster excels in mechanical chronometer accuracy.

Calibre 8400

The Omega Calibre 8400 self winding movement found in the Seamaster 300

The Omega Calibre 8400 – a Self-winding movement with Co-Axial escapement. It’s resistant to magnetic fields greater than 15,000 gauss. Featuring a free sprung-balance with silicon balance spring, two barrels mounted in series, automatic winding in both directions. The bridges and oscillating weight are both decorated with an exclusive Geneva wave design in arabesque

Calibre 8401

The Omega Calibre 8400 self winding movement found in the Seamaster 300

The Omega Calibre 8401 – a Self-winding movement with Co-Axial escapement. Featuring free sprung-balance, 2 barrels mounted in series, automatic winding in both directions. The 8401 stands out with it’s oscillating mass and balance bridge in red gold. Luxury finish with an exclusive Geneva wave design in arabesque

Once fully wound from it’s automatic motion movement – the Seamaster will run for 60 hours. If the watch has been off the wrist for some time it can be boosted by manual winding without the need to pull out the crown (sometimes referred to as hacking)

Recently Listed for Sale

A few stunning examples of Omega Seamster 300 dive watches available from our trusted partners. These sellers have over 99.5% feedback from hundreds of sales. They can be trusted to provide certified genuine Omega watches at excellent prices. All purchases over £2,000 are covered by the comprehensive eBay Authenticity Guarantee

    Confused between models?

    If you are finding it hard to distinguish between the different Omega models – in particular the Omega Seamaster 300, the Omega Seamaster Diver 300m and the Omega Planet Ocean hopefully this will help.

    Omega Seamaster 300 hands

    The hands of an Omega Seamaster 300 original

    If it’s an Omega Seamaster 300 you are interested in – please check the hands look like these above. Just the hour hand with the arrowhead – the minute hand has no arrowhead. We see about 50 – 75% of eBay listings wrongly referring to the Diver 300m as a Seamaster 300. They are both great watches – but please ensure you are getting what you want.

    Omega Seamaster Diver 300m hands

    The hands of an Omega Seamaster Diver 300m for comparison

    The Omega Seamaster Diver 300m is far more common than the Seamaster 300. It’s clearly distinguishable from the others with it’s hollow hands. One with triangular luminous tip (minute hand) and the hour hand with a round luminous marker

    Omega Planet Ocean hands

    The hands of an Omega Seamaster Planet Ocean - both terminating in an arrow

    These are the hands of an Omega Planet Ocean. Both hands are solid and both terminate in a luminous arrowhead.

    Note > Omega do have some exceptions to these general rules such as limited edition models and such like. This is a just an “at a glance” guide.

    Video Reviews

    OMEGA Seamaster 300 Review

    Bruce Williams – Omega Seamaster 300 Review – retro done right


    The Omega Seamaster 300 Wristwatch

    Nick Shabazz – ” Today, we’re going to take a look at a very interesting dive watch, which is capable in the ocean, but more at home in the board room, the Omega Seamaster 300 Master Coaxial (Ref: “




    Calibre: Omega 8400 self-winding movement with Co-Axial escapement. Resistant to magnetic fields greater than 15,000 gauss. Free sprung-balance with silicon balancespring, two barrels mounted in series, automatic winding in both directions. Bridges and the oscillating weight are decorated with exclusive Geneva waves in arabesque.

    Power reserve: 60 hours


    Domed, scratch-resistant sapphire crystal with anti-reflective treatment inside

    Watch Case & Dial

    • Case: Steel
    • Case Diameter: 41 mm
    • Dial Colour: Black

    Water Resistance

    30 bar (300 metres / 1000 feet)


    • Anti-magnetic
    • Chronometer
    • Liquidmetal™
    • Screw-in crown
    • Transparent case back
    • Unidirectional rotating bezel

    Current Models

    In the current range of Omega Seamaster 300 watches there are 16 different variations (as of June 2019). The choice of case material covers everything from steel to platinum, titanium and gold. Straps are available in either leather, titanium, gold or steel. There is the choice of Calibre 8400 or 8401 self winding mechanical movements.

    Omega Seamaster 300 range - steel bracelet versions

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    Omega Seamaster 300 range - leather strap versions

    Authorised Omega shopping partner

    Our online shopping partner is an authorised UK dealer for Omega Seamaster watches. Shop with confidence at Goldsmiths. Relax with the assurance of a genuine Omega Seamaster watch from an authorised dealer.

    This is what our shopping partners say about the Omega Seamaster range

    “The OMEGA Seamaster range of watches was introduced in 1948, and ever since then, the Seamaster collection has been the reference point for divers’ watches throughout the world. A combination of innovative design, technology and style has assured the OMEGA Seamaster is the most desirable timepiece for all diving enthusiasts. Our OMEGA watch range guarantees comfort and reliability during any underwater venture.


    External references / further reading

    Omega Watches.com – all images, specifications and product details