Seiko Cal. 4457 - 767

This Spring Drive model from 1977 features a 40mm Titanium case. Powered by the 4457 caliber with 31j jewels beating at 28,800 bph, it delivers a 43 hours power reserve. [seikata-wm-0bb9fd108506]

Also known as: Sumo, Tuna

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

40mm

Case Thickness

11.4mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

100m

Dial Color

Navy

Jewels

31j

Frequency

28,800 bph

Power Reserve

43 hours

Year

1977

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