Seiko Cal. 5637 - 990

The Seiko 5637-990 represents an important milestone in Seiko's 1999 lineup. With its 19mm lug width and 10.8mm profile, it sits comfortably on most wrists. [seikata-wm-72eb75f242a6]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

10.8mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

200m

Dial Color

Green

Jewels

29j

Frequency

28,800 bph

Power Reserve

42 hours

Year

1999

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