Seiko Cal. 5637 - 644

This Automatic model from 1981 features a 40mm Gold-Plated case. Powered by the 5637 caliber with 31j jewels beating at 36,000 bph, it delivers a 42 hours power reserve. [seikata-wm-a9b2f205a5b7]

Also known as: Pogue, UFO

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

40mm

Case Thickness

8.5mm

Lug Width

19mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

80m

Dial Color

Green

Jewels

31j

Frequency

36,000 bph

Power Reserve

42 hours

Year

1981

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