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Seiko Prospex Marinemaster
1968 Heritage Diver's Watch

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SLA079

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Prospex

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Marinemaster 1968 Heritage Diver's Watch

Ever since its first diver’s watch in 1965, Seiko has developed new technologies, features, and designs that have made its diver’s watches favorites among professional divers and adventurers the world over.
In 1968, just three years after Seiko’s first diver’s watch was made, the brand’s engineers raised the bar by creating a high-beat diver’s watch with 300 meters of water resistance, laying one of the foundation stones on which future Seiko diver’s watch development would be based. It featured a high-precision 10-beat automatic movement, a one-piece case construction, a screw-down crown, and a unidirectional rotating bezel.
The 1968 watch struck a chord with successive generations of sports watch enthusiasts thanks to its robust design and high functionality.
Seiko introduces two new creations that re-interpret the design of 1968 in the Marinemaster collection.

High legibility
for professional use

The high-contrast design, with its precisely controlled color and texture of the dial and indexes, boasts outstanding legibility.

Designs rooted
in heritage

The case has a beautiful, distortion-free mirror surface, as inherited from the original design of 1968. The unique case shape is firmly established as one of today’s signature Seiko diver’s watch designs.

Outstanding grip and easy maintenance

The knurled shape the rotating bezel and crown have been improved for a better grip. To ensure the watch's durability, the crown is not screwed directly into the case but locked into a separate component that is built into the case so it can be more easily replaced.

Bright, long-lasting Lumibrite

The watch is fitted with a high-transparency, dual-curved sapphire crystal with an anti-reflective coating on the inner surface to enhance legibility. High-intensity Lumibrite applied to the indexes and hands helps to increase safety and reduce stress when diving.

A movement made
for diver’s watches

Seiko’s highly accurate and robust Caliber 8L35 is crafted to the highest standards for performance and functional beauty.

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Specifications

Case/Band

Case Material

Stainless steel

Crystal

Curved sapphire crystal

Crystal Coating

Anti-reflective coating on inner surface

LumiBrite

LumiBrite on hands, index(es) and bezel

Clasp

Three-fold clasp with secure lock , push button release with extender

Case Size

Thickness:13.3mm
Diameter:39.0mm
Lug-to-lug:45.5mm

Distance between lugs

20mm

Other Details

Magnetic Resistance

4800 Ampe/m

Weight

161.0g

Features

Unidirectional rotating bezel
Screw-down crown
Three-fold clasp with secure lock and extender
Screw case back

Water Resistance

300m / 1000ft diver's

Movement

Caliber Number

8L35

Movement Type

Automatic with manual winding

Precision

+25 to -15 seconds per day

Power reserve

Approx. 72 hours(3 days)

Functions

28,800 vibrations per hour (8 beats per second)
Stop second hand function
Date display

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