Seiko Cal. 5670 - 631

Seiko 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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