Omega's signature collections are the Speedmaster and Seamaster. Both collections feature a variety of outstanding models that demonstrate Omega's high technical and development capabilities. This time, we will focus on the Seamaster. Let's gain a deeper understanding of its history and modern models.
What is the Omega Seamaster?
The Seamaster, named after the "guardian of the sea," is a model that debuted as part of Omega's diver's line. The Seamaster was born in 1948, exactly 100 years after Omega was founded in 1848.
Omega was also a pioneer in commercial diver's watches. In 1932, more than ten years before the birth of the Seamaster, the company released the Marine. The double case was sealed with a cork, preventing water from entering the center of the watch and significantly reducing the risk of danger to divers.
Later, during World War II, Omega was designated as a watch supplier to the British and Allied forces, and in response to military demands, the company further improved its watches' water resistance, shock resistance, and magnetic resistance. With these improvements in specifications as a backdrop, the Seamaster was born.
Introducing the Omega Seamaster's successive models from the first generation to the 2000s
We will introduce all of Omega's Seamaster models, from the first to the 2000s, in chronological order.
The first Seamaster
Omega's technical expertise was highly praised after it supplied over 11 watches to the British Ministry of Defence between 1940 and 1945.
After the war, there was a demand for watches with a sophisticated design suitable for civilian life, while retaining the durability and reliability cultivated as military watches. The first Seamaster was developed to meet this demand.
This model was the forerunner of modern Omega professional watches.
Seamaster 300
Omega established the "Professional Line" in 1957. This line would later develop into the "Seamaster 300," which was used in undersea exploration, the "Speedmaster," which became a partner of NASA in space exploration, and the "Railmaster," which was resistant to magnetic fields of 1000 gauss.
Seamaster 30
The Seamaster 30 was released in 1962. The "30" in the model name refers not to its water resistance but to the size of its movement. Omega's 30mm caliber was so popular that it was mass-produced.
The Seamaster 30 is manufactured with an emphasis on durability so that it will not break, so even one in good condition can be purchased for around 10 yen.
Seamaster 60
The Seamaster 60, which was released in 1969, was water resistant to 60m and was produced in three color variations: black, blue, and red.
The case is the same one used for some Speedmasters and was manufactured by La Central Boite, a case manufacturer used by Omega in the 1960s.
Originally designed for women, the case diameter is 37mm, which is modest for a diver's watch, but from a modern perspective, it is a model that can be worn by most men.
Seamaster 600 Ploprof
In the 1970s, the Seamaster Professional 600 was released. It was commonly known by the nickname "Ploprof," a coined word derived from the French term "plongeur professionnel," meaning "professional diver." (Note that "Ploprof" has now been promoted to the official model name.)
To ensure the safety of divers, the monobloc case features a screw-down crown at 9 o'clock and a locking mechanism at 2 o'clock, preventing the bezel from accidentally rotating underwater unless the locking mechanism is released.
Seamaster Cosmic 2000
"Cosmic" means "space" in English, and this model features a case in which the body and back cover are integrated into one piece.
This model has excellent waterproof and dustproof properties and improved durability, and the quality has been improved compared to the Cosmic, the predecessor of the Cosmic 2000, by adopting a larger case and glass windproof glass.
Seamaster Professional 200
The Seamaster Professional 200, which was released in 1978, can be considered the predecessor of the current model, the Seamaster 300.
Its high performance was also evident when it was selected by the French government agency, the Office of Naval Hydrography and Oceanography (SHOM), in 1978, for its significant contribution to the official task of producing nautical charts.
Today, in recognition of its achievements, this model is also known as the "Seamaster Professional "SHOM".
Omega Seamaster "2000s and Beyond" Models
Since the Seamaster 300 was introduced in 1957, the Seamaster collection has offered a variety of models.
The current Seamaster series is based on four lines: Aqua Terra 150M, Diver 300, Planet Ocean 600M, and Heritage.
Seamaster Aqua Terra 150M
While maintaining the performance of the Seamaster, this watch incorporates elegant details suitable for business settings, such as classic twisted lugs and a teak-patterned dial. Automatic movement (Cal. 8900). 39 jewels. 25,200 vph. Power reserve of approximately 60 hours. Stainless steel case (diameter 41mm, thickness 13.2mm). Water resistant to 15 bar. Price: 1,001,000 yen (tax included).
The Seamaster Aqua Terra was born in 2002. Aqua is a Latin word meaning "sea" and terra means "earth," referring to the field in which the model is used. In other words, it is a model that can be used in a variety of situations, from active scenes such as the sea to everyday business scenes.
The dial features a teak pattern inspired by the wooden decks of luxury yachts. While incorporating dressy elements, it retains the Seamaster's high shock resistance and 150m water resistance.
Seamaster Diver 300M
Since its introduction in 1993, this Seamaster has been a popular icon. The current model features a ceramic dial, magnetic resistance of over 15,000 gauss, and a Co-Axial escapement to reduce friction in the escapement, continuing to evolve both inside and out. Automatic winding (Cal. 8800). 35 jewels. 25,200 vph. Power reserve of approximately 55 hours. Stainless steel case (42mm diameter, 13.6mm thick). Water resistant to 30 bar. Price: 946,000 yen (tax included).
Omega established itself as a diver's watch with the introduction of the Seamaster 300, and in 1993 released the new Seamaster Professional Diver 300M.
With high water resistance up to 300m, and features such as a diving bezel and helium escape valve, it is designed for practical use in diving activities. It is truly a professional-grade timepiece.
Seamaster Planet Ocean
In 2025, the Seamaster Planet Ocean underwent major design changes. The edgy case was made smaller and thinner, and the helium escape valve was also eliminated. However, the original 600m water resistance remains. Automatic movement (Cal. 8912). 39 jewels. 25,200 vph. Power reserve approximately 60 hours. Stainless steel and titanium case (42mm diameter, 13.79mm thick). 600m water resistance. Price: 1,309,000 yen (tax included).
Aiming to explore even deeper into the ocean, Omega released a new timepiece in 2005: the Seamaster Planet Ocean.
This model, part of the ultra-authentic diver's line, is water resistant to over 600m. This series has shifted its focus to higher water resistance for professionals, and there is no doubt that it is a watch that is highly sought after by professionals who work in the deep sea.
Heritage Model
The Seamaster 300, which was added to the collection in 2014, underwent a model change in 2021. It now features more vintage design elements, such as an aluminum plate bezel and a lollipop second hand, while performance has been improved with the addition of the Master Chronometer-certified movement, Cal. 8912. Automatic winding (Cal. 8912). 38 jewels. 25,200 vph. Power reserve of approximately 60 hours. Stainless steel case (diameter 41mm, thickness 13.9mm). Water resistant to 300m. Price: 1,122,000 yen (tax included).
The Heritage Model is a collection modeled after Omega's historic timepieces.
The "Trilogy," a reproduction of the Seamaster, Speedmaster, and Railmaster trilogy released by Omega in 1957, and the "Olympic Model," which evokes the brand's history as the official timekeeper of the Olympic Games since 1032, are also attractive, but the most famous of the Heritage models is the "Seamaster 300."
Although this model follows the design of the Seamaster 300, which was released in 1957, it is not a complete reproduction, and is characterized by the addition of modern elements to both the exterior and internal mechanism, as Omega calls it ``for a new generation of adventurers.''
In particular, since its model change in 2021, it has been equipped with a Master Chronometer-certified movement, boasting even more excellent performance, including ultra-magnetic resistance. As with other collections, there are variations in straps and exterior materials, so it can be said that this model offers fun choices.
The Omega Seamaster is perfect for any occasion
The Seamaster is a watch that has been designed with a simple finish and no compromises have been made, and the body is packed with the mechanisms necessary for use underwater. Although it has a strong image as a diving watch, it also comes in designs that are easy to wear in business settings.
By choosing based on the occasion you will be wearing it and the specifications you need, you will be able to use it with greater satisfaction.
