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Three new Prospex creations celebrate the 60th anniversary of the Seiko diver’s watch
Seiko’s heritage in diver’s watches began in 1965 with the creation of Japan’s first diver’s watch. Since then, Seiko has continuously advanced in diver’s watchmaking to meet the demands of professional divers. Over six decades of innovation, Seiko has introduced landmark timepieces that have enhanced safety, reliability, legibility, and ease of use, building a legacy that is upheld today by the Prospex collection. The year 2025 marks the 60th anniversary of the Seiko diver’s watch. In commemoration of this milestone, three new creations are introduced into the Prospex collection.
The first of these new watches, powered by the new Caliber 8L45, joins Seiko’s flagship series for diver’s watches, Marinemaster, which combines exceptional performance with refined design and craftsmanship. Its exterior traces the familiar contours of an early and iconic Seiko diver’s watch that was introduced in 1968, while its construction finds inspiration in another innovative Seiko diver born in 1975.
The new Caliber 8L45 represents the pinnacle of Seiko’s mechanical watch movements. It incorporates Spron, Seiko’s proprietary alloy, designed for durability against breakage, rust, and wear, ensuring resilience in harsh underwater conditions. A thinner, longer mainspring provides 72 hours of power reserve, while an improved method for securing the movement within the case enhances durability. In addition to its longer power reserve, Caliber 8L45 operates within a tolerance of +10 to -5 seconds per day.
A dial inspired by shinkai, or “the deep sea”
capturing the mysterious and beautiful underwater world.
The watch features a new textured dial whose pattern evokes the deep sea. To ensure reliability and safety, the indexes are formed as part of the dial through a molding process and will stay firmly in place, even under impact. A thick, clear paint adds a lustrous finish to enhance the beauty of the dial while achieving an unprecedented level of depth.
A case construction using Seiko’s latest watchmaking technology
The watch features a one-piece titanium case construction that ensures water resistance to depths of 600 meters, suitable for saturation diving. As a mark of its professional-grade capabilities, the word “PROFESSIONAL” is inscribed on the dial. Just like Seiko’s historic diver’s watch introduced in 1975, it features a specially developed L-shaped gasket to prevent helium infiltration, eliminating the need for an escape valve.
back, allowing for a seamless aesthetic.
The stainless-steel bezel insert has been treated with diamond-like carbon coating to achieve a surface hardness approximately six times greater than it would otherwise be, making it significantly more resistant to scratches. The newly developed bracelet features rounded links designed to provide a flexible and comfortable fit.
The watch will be available as a limited edition of 600 at the Seiko Boutiques and select retail stores worldwide from July 2025.
Supporting JAMSTEC’s Arctic Research
Seiko Prospex actively supports various marine conservation initiatives by contributing to the Japan Agency for Marine-Earth Science and Technology (JAMSTEC) research team, and this watch is set to become part of JAMSTEC’s Arctic research program in 2025.
Seiko and JAMSTEC share a remarkable history of innovation and resilience. In 1983, two professional diver’s watches rated to 600 meters of water resistance were successfully tested on the Shinkai 2000, a research submersible operated by JAMSTEC. In 2014, both automatic and quartz 1,000-meter saturation diver’s watches were mounted on the Kaiko 7000 II, demonstrating exceptional performance by operating flawlessly at depths exceeding 3,000 meters, surpassing their guaranteed specifications.
Two creations inspired by Seiko’s underwater heritage join the celebration
Two more creations join the Prospex collection in celebration of the 60th anniversary of the Seiko diver’s watch. The watches showcase a fresh dial design – one in silver color and the other in blue – drawing inspiration from the wave mark, a symbol of reliability found on the case back of Prospex diver’s watches. The silver-dialed model pays homage to Seiko’s first diver’s watch from 1965, while the blue-dialed version reflects the design of the 1968 diver’s watch.
Both are powered by the long-trusted Caliber 6R family. The watch with the silver-colored dial is equipped with Caliber 6R55, while the blue-dialed model features the GMT Caliber 6R54. The GMT hand of the latter can be set independently without interrupting the other hands, allowing the wearer to see, at a glance, the time in a second time zone. Both movements deliver a power reserve of 72 hours and are water-resistant to 300 meters – an improvement of 100 meters compared to previous diver’s watches equipped with Caliber 6R54. The watches have Lumibrite on the hands and all 12 indexes and feature a unidirectional bezel with a luminous pip.
Both creations feature an updated clasp, which allows a 15mm adjustment range, easily extended or shortened in six 2.5mm increments by pressing side buttons. This ensures a comfortable fit, adapting to changes in wrist size caused by diving pressure or the weather.
Each of the two 6R-powered creations will be available as a limited edition of 6,000 at the Seiko Boutiques and select retail stores worldwide from June 2025.
About the original 1965 and 1968 diver’s watches
Known to fans as the 62MAS, the 1965 diver’s watch incorporated an automatic mechanical movement and delivered 150m water resistance. The watch was designed for maximum reliability and legibility in the harshest conditions and proved its reliability when used in the Antarctic during the 1960s, laying the path for the development of future landmark watches.
The 1968 diver’s watch was a groundbreaking professional watch with a high-beat automatic movement and 300m water resistance. Known for its distinctive design, including a rotating bezel and a screw-down crown at 4 o’clock, it set new standards in dive watch innovation.
Seiko Prospex Marinemaster Professional
Seiko Diver's Watch 60th Anniversary Limited Edition
Caliber 8L45
Driving system: Automatic
Frequency: 28,800 vibrations per hour (8 beats per second)
Power reserve: 72 hours
Number of jewels: 35
Diameter: 28.4mm, Thickness: 6.0mm
Specifications
Titanium case with super-hard coating (partly stainless steel.)
Titanium bracelet with super-hard coating, three-fold clasp with push-button release, secure lock, and slide adjuster
Dual-curved sapphire crystal with anti-reflective coating on the inner surface
Screw-down crown
Lumibrite on hands and indexes
Diameter: 45.4mm, Thickness: 16.0mm
Water resistance: 600m saturation diver’s
Magnetic resistance: 4,800 A/m
Recommended retail price in USA: $4,600
Limited edition of 600
Seiko Prospex 1968 Heritage Diver’s GMT Watch
Seiko Diver's Watch 60th Anniversary Limited Edition
Caliber 6R54
Driving system: Automatic
Frequency: 21,600 vibrations per hour (6 beats per second)
Power reserve: 72 hours
GMT function / Independent 24-hour hand adjustment function
Specifications
Stainless steel case with super-hard coating
Stainless steel bracelet with super-hard coating, three-fold clasp with push-button release, secure lock, and slide adjuster
Sapphire crystal with anti-reflective coating on the inner surface
Screw case back, screw-down crown
Lumibrite on hands and indexes
Diameter: 42.0mm, Thickness: 13.3mm
Water resistance: 300m diver’s
Magnetic resistance: 4,800 A/m
Recommended retail price in USA: $1,750
Limited edition of 6,000
Seiko Prospex 1965 Heritage Diver’s Watch
Seiko Diver’s Watch 60th Anniversary Limited Edition
Caliber 6R55
Driving system: Automatic
Frequency: 21,600 vibrations per hour (6 beats per second)
Power reserve: 72 hours (3 days)
Specifications
Stainless steel case with super-hard coating
Stainless steel bracelet with super-hard coating, three-fold clasp with push-button release, secure lock, and slide adjuster
Curved sapphire crystal with anti-reflective coating on the inner surface
Screw case back, screw-down crown
Lumibrite on hands and indexes
Diameter: 40.0mm, Thickness: 13.0mm
Water resistance: 300m diver’s
Magnetic resistance: 4,800 A/m
Recommended retail price in USA: $1,400
Limited edition of 6,000