Seiko Cal. 5631 - 643

Seiko 5631-643

This Spring Drive model from 1990 features a 41mm Two-Tone case. The Fixed bezel and 41mm case give it a distinctive presence on the wrist. [seikata-wm-71a72df14e53]

Also known as: Monster, Golden Tuna

Specifications

Movement
Spring Drive
Case Material
Two-Tone
Case Width
41mm
Case Thickness
14.3mm
Lug Width
22mm
Crystal
Hardlex
Bezel
Fixed
Water Resistance
160m
Dial Color
Blue Sunburst
Jewels
32j
Frequency
21,600 bph
Power Reserve
38 hours
Year
1990

Related Models

seikata-wm-71a72df14e53