A modern re-interpretation of the first Seiko diver’s watch, created in 1965.

In 1965, Seiko introduced its, and Japan’s, first-ever diver’s watch. Known to fans as the 62MAS,
it incorporated an automatic mechanical caliber and delivered 150m water resistance. Designed
for maximum reliability and legibility in the harshest conditions, the 62MAS laid the path to
the development of future landmark watches that won the favor of professional divers and adventurers alike.

The original 62MAS (left) and the modern re-interpretation SLA065 (right.)


Marketing Communications Office
26-1, Ginza 1-chome, Chuo-ku, Tokyo 104-8118, Japan mail: seiko-pr@seiko-watch.co.jp seikowatches.com

Today, Seiko introduces a new re-interpretation of this celebrated 1965 diver’s watch with a dial whose design evokes centuries-old synergy of technology and seafaring.

As part of Prospex’s mission to contribute to the greater understanding and preservation of the world’s oceans, Seiko delivers financial and other support to chosen marine charities. One of these is an underwater archaeology project whose aim is to explore historical sites to protect their cultural heritage for future generations. Among these sites is one close to the Greek island of Fournoi where lie many ships that sank in the 4th century CE. Researchers are surveying and excavating them to learn more about the marine trading system in the Mediter-ranean at that time. 

The dial pattern of new diver’s watch is inspired by the astrolabe, the ancient navigational tool that seafarers, perhaps including some of those who braved the rocky coastlines of Fournoi, used to determine the latitude and time of their location based on the position of the stars and the sun, and so assist their navigation.

The astrolabe-inspired dial design captures the Prospex spirit of adventure.

A heritage design with the most advanced technologies

While the watch’s design reflects its heritage, every aspect of this new creation is fully up to date in specification and execution. The watch is powered by Caliber 8L35, developed espe-cially for diver’s watches and hand-assembled by Seiko’s most skilled craftsmen and women. The movement’s rigidity and accuracy ensure the highest possible levels of performance in the most demanding environments, both on land and under water.

Caliber 8L35, created especially for Seiko’s leading diver’s watches.

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. All twelve-hour markers have a generous coating of Lumibrite, as do the hands, and the crystal is a dual-curved sapphire with anti-reflective coating on the inner surface to ensure high legibility from every angle. The strap is produced in silicone for greater strength and comfort.

This watch joins the Save the Ocean series and will be available as a limited edition of 1,300 from February 2023 at the Seiko Boutiques and select retail partners worldwide.

Seiko Prospex Save the Ocean Limited Edition

Caliber 8L35
Driving system: Automatic
Frequency: 28,800 vibrations per hour (8 beats per second)
Power reserve: 50 hours
Number of jewels: 26

Stainless steel case with super-hard coating
Dual-curved sapphire crystal with anti-reflective coating on the
inner surface
Screw case back. Screw-down crown.
LumiBrite on hands and indexes
Water resistance: 200m diver’s
Magnetic resistance: 4,800 A/m
Diameter: 41.3mm, Thickness: 13.1mm
Silicone strap
Recommended retail price in Europe: €3,000
Limited edition of 1,300

For further information

Special web page:

Seiko Prospex web page:

*The specifications and price information in this release are of the published date and are subject to

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