Seiko Cal. 5631 - 953

The Seiko 5631-953 represents an important milestone in Seiko's 1987 lineup. The Bidirectional bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-227a8c4ff817]

Also known as: Sumo, UFO

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

35mm

Case Thickness

15.4mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

40m

Dial Color

Burgundy

Jewels

35j

Frequency

28,800 bph

Power Reserve

67 hours

Year

1987

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