Seiko Cal. 5631 - 671

The Seiko 5631-671 represents an important milestone in Seiko's 1967 lineup. Powered by the 5631 caliber with 29j jewels beating at 36,000 bph, it delivers a 38 hours power reserve. [seikata-wm-7c1b5a82ef8b]

Also known as: Rally

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

42mm

Case Thickness

14.3mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

110m

Dial Color

Black

Jewels

29j

Frequency

36,000 bph

Power Reserve

38 hours

Year

1967

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