In 1965, Seiko introduced its, and Japan’s, first-ever diver’s watch, known to fans as the 62MAS. Designed for maximum reliability and legibility in the harshest conditions, the 62MAS laid the path to the development of numerous landmark watches that won the favor of professional divers and adventurers alike.

As part of its Save the Ocean initiative, Seiko Prospex supports chosen marine charities. One of these is an underwater archeology project exploring a historical site in Greece to protect its cultural heritage for future generations.

Today, Seiko Prospex introduces a new interpretation of its 1965 diver’s watch inspired by the world of underwater archeology and this project.

Caliber 8L35, Seiko’s leading mechanical movement

Developed especially for diver’s watches, the Caliber 8L35 is Seiko’s leading mechanical movement, crafted to the highest standards for performance and functional beauty. Every detail of its construction can be traced back to Seiko’s time-tested expertise in creating cutting-edge mechanical movements from the ground up. Below, learn more about the special features that distinguish this expertly crafted movement.

The new creation’s patterned dial echoes that of a marine astrolabe, an ancient navigational tool considered one of the most commonly recovered artifacts from underwater archaeological sites. The design captures the complexity of the astrolabe, and one can sense the adventurous spirit of those who explored the high seas in a bygone era.

While the watch’s design reflects its heritage, every aspect of this new creation is fully up to date in specification and execution. The bevel between the upper case and case side, as well as the surface around the bezel display, are Zaratsu polished to a distortion-free mirror finish to achieve a modern sharpness. A silicone strap provides strength and comfort on the wrist.

All twelve hour markers have a generous coating of Lumibrite, as do the hands. The crystal is a dual-curved sapphire with an anti-reflective coating on the inner surface to ensure high legibility from every angle.