They’re the OG splash-maker in the world of timepieces! 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 divers 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 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”
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.
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.
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 colour 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-coloured 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 Seiko Boutiques and select retail stores worldwide from June 2025.
Hit up Seiko’s official website for more details.
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