Seiko Cal. 5637 - 275

This Spring Drive model from 1970 features a 44mm Hardlex-Coated Steel case. Powered by the 5637 caliber with 24j jewels beating at 28,800 bph, it delivers a 65 hours power reserve. [seikata-wm-8c34c8f07ba2]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

15.0mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

70m

Dial Color

Burgundy

Jewels

24j

Frequency

28,800 bph

Power Reserve

65 hours

Year

1970

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