Seiko Cal. 5631 - 618

This Automatic model from 1972 features a 39mm Gold-Plated case. Powered by the 5631 caliber with 21j jewels beating at 28,800 bph, it delivers a 59 hours power reserve. [seikata-wm-dc68a1a6614e]

Also known as: Helmet

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

39mm

Case Thickness

14.6mm

Lug Width

22mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

190m

Dial Color

Navy

Jewels

21j

Frequency

28,800 bph

Power Reserve

59 hours

Year

1972

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