Seiko Cal. 5637 - 642

The 5637-642 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 5637 caliber with 20j jewels beating at 36,000 bph, it delivers a 68 hours power reserve. [seikata-wm-121b449520d4]

Also known as: Crown, Flighty

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

37mm

Case Thickness

9.9mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Green

Jewels

20j

Frequency

36,000 bph

Power Reserve

68 hours

Year

1981

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