Seiko Cal. 5639 - 242

This Quartz model from 1972 features a 42mm Stainless Steel case. Powered by the 5639 caliber with 25j jewels beating at 36,000 bph, it delivers a 66 hours power reserve. [seikata-wm-a5123f06f8cf]

Also known as: Sumo, Sea Horse

Specifications

Movement

Quartz

Case Material

Stainless Steel

Case Width

42mm

Case Thickness

15.1mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

50m

Dial Color

Black

Jewels

25j

Frequency

36,000 bph

Power Reserve

66 hours

Year

1972

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