Seiko Cal. 5637 - 390

This Hand-Winding model from 1970 features a 36mm PVD Black case. Powered by the 5637 caliber with 31j jewels beating at 28,800 bph, it delivers a 65 hours power reserve. [seikata-wm-b3fa5b03036c]

Also known as: Bellmatic

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

36mm

Case Thickness

15.9mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

190m

Dial Color

Cream

Jewels

31j

Frequency

28,800 bph

Power Reserve

65 hours

Year

1970

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