Seiko Cal. 5631 - 775

This Spring Drive model from 1972 features a 39mm Gold-Plated case. Powered by the 5631 caliber with 18j jewels beating at 28,800 bph, it delivers a 37 hours power reserve. [seikata-wm-6d9e07da6230]

Also known as: Rally, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

39mm

Case Thickness

15.1mm

Lug Width

22mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

60m

Dial Color

Burgundy

Jewels

18j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1972

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