Seiko Cal. 5637 - 388

The Seiko 5637-388 represents an important milestone in Seiko's 1991 lineup. Powered by the 5637 caliber with 23j jewels beating at 36,000 bph, it delivers a 64 hours power reserve. [seikata-wm-158942ab46af]

Also known as: Helmet

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

11.7mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

Blue Sunburst

Jewels

23j

Frequency

36,000 bph

Power Reserve

64 hours

Year

1991

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