Seiko Cal. 5631 - 518

This Automatic model from 1984 features a 40mm Hardlex-Coated Steel case. Powered by the 5631 caliber with 22j jewels beating at 36,000 bph, it delivers a 63 hours power reserve. [seikata-wm-7df21dab7f2a]

Also known as: Shogun, Sea Horse

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

11.2mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

120m

Dial Color

Blue Sunburst

Jewels

22j

Frequency

36,000 bph

Power Reserve

63 hours

Year

1984

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