Seiko Cal. 5631 - 990

The Seiko 5631-990 represents an important milestone in Seiko's 1993 lineup. The Bidirectional bezel and 43mm case give it a distinctive presence on the wrist. [seikata-wm-07b8dc46b199]

Also known as: Crown, Baby Tuna

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

12.0mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

80m

Dial Color

Cream

Jewels

32j

Frequency

36,000 bph

Power Reserve

45 hours

Year

1993

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