Seiko Cal. 5631 - 654

Seiko 5631-654

The Seiko 5631-654 represents an important milestone in Seiko's 1980 lineup. Powered by the 5631 caliber with 34j jewels beating at 21,600 bph, it delivers a 38 hours power reserve. [seikata-wm-0906285a64eb]

Also known as: Monster, Rally

Specifications

Movement
Hand-Winding
Case Material
Hardlex-Coated Steel
Case Width
42mm
Case Thickness
8.5mm
Lug Width
19mm
Crystal
Sapphire
Bezel
Rotating
Water Resistance
60m
Dial Color
Navy
Jewels
34j
Frequency
21,600 bph
Power Reserve
38 hours
Year
1980

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