Seiko Cal. 5637 - 442

The Seiko 5637-442 represents an important milestone in Seiko's 1988 lineup. The Bidirectional bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-7af945fe1ab6]

Also known as: Arnie, Flighty

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

37mm

Case Thickness

15.3mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

40m

Dial Color

Black

Jewels

20j

Frequency

21,600 bph

Power Reserve

66 hours

Year

1988

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