Seiko Cal. 5631 - 804

Seiko 5631-804

This Quartz model from 1980 features a 37mm Two-Tone case. With its 20mm lug width and 11.9mm profile, it sits comfortably on most wrists. [seikata-wm-18b0fbcb74a0]

Also known as: Monster, Silverwave

Specifications

Movement
Quartz
Case Material
Two-Tone
Case Width
37mm
Case Thickness
11.9mm
Lug Width
20mm
Crystal
Sapphire
Bezel
Coin-Edge
Water Resistance
140m
Dial Color
Blue Sunburst
Jewels
26j
Frequency
28,800 bph
Power Reserve
47 hours
Year
1980

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