Seiko Cal. 5631 - 879

Seiko 5631-879

This Spring Drive model from 1987 features a 34mm Hardlex-Coated Steel case. The Fixed bezel and 34mm case give it a distinctive presence on the wrist. [seikata-wm-d4361e8955f0]

Also known as: Monster

Specifications

Movement
Spring Drive
Case Material
Hardlex-Coated Steel
Case Width
34mm
Case Thickness
8.2mm
Lug Width
20mm
Crystal
Acrylic
Bezel
Fixed
Water Resistance
40m
Dial Color
Black
Jewels
29j
Frequency
28,800 bph
Power Reserve
49 hours
Year
1987

Related Models

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