Seiko Cal. 5670 - 631

The Seiko 5670-631 represents an important milestone in Seiko's 1981 lineup. Powered by the 5670 caliber with 27j jewels beating at 36,000 bph, it delivers a 64 hours power reserve. [seikata-wm-920b4d59defe]

Also known as: UFO, Rally

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

14.7mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Burgundy

Jewels

27j

Frequency

36,000 bph

Power Reserve

64 hours

Year

1981

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