Seiko Cal. 5631 - 859

Seiko 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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seikata-wm-ee8c562e07f8