Seiko Cal. 5637 - 400

The Seiko 5637-400 represents an important milestone in Seiko's 1991 lineup. The Fixed bezel and 43mm case give it a distinctive presence on the wrist. [seikata-wm-91fdd92edaa0]

Also known as: Baby Tuna

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

43mm

Case Thickness

8.8mm

Lug Width

21mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

150m

Dial Color

Burgundy

Jewels

22j

Frequency

36,000 bph

Power Reserve

41 hours

Year

1991

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