Seiko Releases Three Limited Prospex Models Honoring 60 Years of Diver’s Watch Legacy

One of the creations is powered by the new Caliber 8L45 and joins the Marinemaster series.

A Legacy Born from the Depths

In 1965, a simple letter from a professional diver changed everything. Seeking a timepiece that could withstand the extreme pressures of deep-sea exploration, this request sparked Seiko’s journey into uncharted horological territory. The result was Japan’s first diver’s watch – a groundbreaking achievement that would define underwater timekeeping for generations to come.

The Pioneer Collection: Three Masterpieces for 2025

To commemorate this remarkable milestone, Seiko unveils three extraordinary timepieces that bridge six decades of innovation with tomorrow’s technology:

The Marinemaster Professional Edition
Leading the anniversary collection is the flagship Marinemaster, powered by Seiko’s revolutionary new Caliber 8L45. This 28,800 bph movement delivers an impressive 72-hour power reserve while maintaining chronometer-grade precision. The one-piece titanium case construction achieves professional-grade 600-meter water resistance, making it suitable for the most demanding saturation diving operations. Limited to just 600 pieces worldwide, this timepiece represents the pinnacle of Seiko’s diving watch expertise.

The Heritage 62MAS Tribute

Honoring the original 1965 design that started it all, this faithful recreation captures the essence of the legendary 62MAS while incorporating modern reliability. The updated 6R movement ensures contemporary performance standards, while the classic case proportions and dial layout pay homage to the watch that proved Japanese diving instruments could compete on the world stage.

The Professional Evolution

Drawing inspiration from the groundbreaking 1968 model that introduced high-beat movements to diving watches, this edition features enhanced legibility, improved ergonomics, and the distinctive 4 o’clock crown position that became a hallmark of professional diving instruments.

Revolutionary Technologies

Each anniversary model incorporates cutting-edge innovations that push the boundaries of underwater timekeeping. The advanced L-shaped gasket system eliminates helium infiltration without requiring traditional escape valves, while diamond-like carbon coating on the bezel insert provides scratch resistance six times greater than standard materials.

Supporting Ocean Conservation

True to Seiko’s commitment to marine preservation, these anniversary models will support ongoing research initiatives with the Japan Agency for Marine-Earth Science and Technology (JAMSTEC). This partnership continues a legacy of deep-sea exploration that has seen Seiko timepieces tested at depths exceeding 3,000 meters aboard research submersibles.

A Testament to Endurance

From the Antarctic expeditions of the 1960s to today’s cutting-edge marine research, Seiko diving watches have consistently proven their reliability in the world’s most challenging environments. The 60th anniversary collection represents not just a celebration of the past, but a bold statement about the future of professional diving instruments.

Availability and Legacy

The Marinemaster Professional Edition will be available at select Seiko boutiques from July 2025, while the Heritage models launch in June 2025. Each timepiece represents a limited opportunity to own a piece of diving history while contributing to the next chapter of underwater exploration.

This anniversary collection stands as proof that innovation never rests beneath the waves, and that the spirit of that first professional diver’s request continues to drive Seiko’s relentless pursuit of underwater excellence.

Seiko Prospex Marinemaster Professional

60th Anniversary Limited Edition

Seiko Diver's Watch

SLA081

1968 Heritage Diver’s GMT Watch

60th Anniversary Limited Edition

Seiko Diver's Watch

SLA081

1965 Heritage Diver’s Watch

60th Anniversary Limited Edition

Seiko Diver's Watch

SLA081