Seiko Cal. 5637 - 255

This Hand-Winding model from 1977 features a 40mm Hardlex-Coated Steel case. Powered by the 5637 caliber with 31j jewels beating at 28,800 bph, it delivers a 41 hours power reserve. [seikata-wm-df567cd0dbc7]

Also known as: Tuna, Rally

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

15.5mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

50m

Dial Color

Cream

Jewels

31j

Frequency

28,800 bph

Power Reserve

41 hours

Year

1977

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