Seiko Cal. 5631 - 959

This Solar model from 1979 features a 40mm Stainless Steel case. The Bidirectional bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-7242f33a98c8]

Also known as: Tuna

Specifications

Movement

Solar

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

10.9mm

Lug Width

19mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

120m

Dial Color

Silver

Jewels

22j

Frequency

28,800 bph

Power Reserve

42 hours

Year

1979

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