Seiko Cal. 5631 - 706

This Quartz model from 1978 features a 38mm Stainless Steel case. Powered by the 5631 caliber with 17j jewels beating at 21,600 bph, it delivers a 43 hours power reserve. [seikata-wm-64ef9de281b1]

Also known as: Sumo, Tuna

Specifications

Movement

Quartz

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

8.2mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Green

Jewels

17j

Frequency

21,600 bph

Power Reserve

43 hours

Year

1978

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