Seiko Cal. 5631 - 312

Seiko 5631-312

The Seiko 5631-312 represents an important milestone in Seiko's 1972 lineup. Powered by the 5631 caliber with 19j jewels beating at 28,800 bph, it delivers a 63 hours power reserve. [seikata-wm-2223bbd9fe49]

Also known as: Rally, Golden Tuna

Specifications

Movement
Hand-Winding
Case Material
Hardlex-Coated Steel
Case Width
45mm
Case Thickness
9.8mm
Lug Width
20mm
Crystal
Hardlex
Bezel
Fixed
Water Resistance
30m
Dial Color
Green
Jewels
19j
Frequency
28,800 bph
Power Reserve
63 hours
Year
1972

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