Seiko Cal. 5631 - 859

This Spring Drive model from 1968 features a 41mm Hardlex-Coated Steel case. Powered by the 5631 caliber with 35j jewels beating at 21,600 bph, it delivers a 44 hours power reserve. [seikata-wm-ee8c562e07f8]

Also known as: Silverwave, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

12.4mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

90m

Dial Color

Black

Jewels

35j

Frequency

21,600 bph

Power Reserve

44 hours

Year

1968

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