Seiko Cal. 5637 - 291

The Seiko 5637-291 represents an important milestone in Seiko's 1980 lineup. With its 21mm lug width and 9.5mm profile, it sits comfortably on most wrists. [seikata-wm-1d90d233b2b0]

Also known as: Sumo, Tuna

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

35mm

Case Thickness

9.5mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

30m

Dial Color

Cream

Jewels

26j

Frequency

21,600 bph

Power Reserve

46 hours

Year

1980

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