Seiko Cal. 7131 - 763

This Spring Drive model from 1968 features a 37mm PVD Black case. The Fixed bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-d76ada1bd8f5]

Also known as: Helmet, Emperor

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

15.2mm

Lug Width

22mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

40m

Dial Color

Burgundy

Jewels

26j

Frequency

28,800 bph

Power Reserve

50 hours

Year

1968

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