Seiko Cal. 5637 - 520

The 5637-520 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5637 caliber with 31j jewels beating at 21,600 bph, it delivers a 57 hours power reserve. [seikata-wm-3880faf2adc1]

Also known as: Bellmatic, Flighty

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

36mm

Case Thickness

14.9mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

80m

Dial Color

Silver

Jewels

31j

Frequency

21,600 bph

Power Reserve

57 hours

Year

1984

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