Seiko Cal. 5631 - 308

The 5631-308 is a sought-after Automatic piece from Seiko's golden era. Powered by the 5631 caliber with 22j jewels beating at 36,000 bph, it delivers a 58 hours power reserve. [seikata-wm-22eca0c03152]

Also known as: Monster, Sportsmatic

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

36mm

Case Thickness

14.1mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Blue Sunburst

Jewels

22j

Frequency

36,000 bph

Power Reserve

58 hours

Year

1972

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