Seiko Cal. 5631 - 671

Seiko 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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