Seiko Cal. 5631 - 883

The Seiko 5631-883 represents an important milestone in Seiko's 1971 lineup. Powered by the 5631 caliber with 25j jewels beating at 21,600 bph, it delivers a 42 hours power reserve. [seikata-wm-fe73ff970495]

Also known as: UFO

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

40mm

Case Thickness

8.6mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

170m

Dial Color

Silver

Jewels

25j

Frequency

21,600 bph

Power Reserve

42 hours

Year

1971

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