Seiko Cal. 5631 - 555

Seiko 5631-555

This Automatic model from 1981 features a 39mm Stainless Steel case. Powered by the 5631 caliber with 25j jewels beating at 28,800 bph, it delivers a 64 hours power reserve. [seikata-wm-7869ad7c0cdd]

Also known as: Helmet

Specifications

Movement
Automatic
Case Material
Stainless Steel
Case Width
39mm
Case Thickness
8.9mm
Lug Width
19mm
Crystal
Acrylic
Bezel
Rotating
Water Resistance
120m
Dial Color
Champagne
Jewels
25j
Frequency
28,800 bph
Power Reserve
64 hours
Year
1981

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