Seiko Cal. 7138 - 831

This Spring Drive model from 1978 features a 39mm Gold-Plated case. Powered by the 7138 caliber with 31j jewels beating at 21,600 bph, it delivers a 37 hours power reserve. [seikata-wm-555c063529b6]

Also known as: Golden Tuna, Flighty

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

39mm

Case Thickness

11.7mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

70m

Dial Color

Burgundy

Jewels

31j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1978

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