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.

Detailed dial

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.

Case design

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.

Lumibrite

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.

Save the Ocean
Supporting Underwater Archeology

Seiko is proud to support an underwater archeology project that is exploring a historical site with the aim of protecting its cultural heritage for future generations. 

Fournoi Underwater Survey and Excavation Project in Greece

Off the Greek island of Fournoi lie many ships that sank in the 4th century. The project team is surveying and excavating them to learn more about the marine trading system in the Mediterranean at that time. Since 2015, 58 historically significant shipwrecks have been discovered around this Aegean island.

Specifications

Movement

Caliber Number

8L35

Movement Type

Automatic with manual winding

Precision

+15 to -10 seconds per day

Power reserve

Approx. 50 hours

Jewels

26

Functions

• Stop seconds hand function
• Date display

Case/Band

Case Material

Stainless steel (super hard coating)

Case Size

Thickness:13.1mm
Diameter:41.3mm
Lug-to-lug:47.6mm

Crystal

Dual-curved sapphire crystal

Crystal Coating

Anti-reflective coating on inner surface

LumiBrite

LumiBrite on hands, index(es) and bezel

Band Material

Silicone

Bracelet Length

210.0

Distance between lugs

20

Other Details

Water Resistance

200m / 660ft diver's

Magnetic Resistance

4,800 A/m

Weight

112.0

Features

• LIMITED EDITION on the case back
• Serial number engraved on the case back
• Unidirectional rotating bezel
• Screw-down crown
• Screw case back

• * In an actual product, the case back direction might be different from the photograph.