Seiko Cal. 4431 - 988

Seiko 4431-988

This Spring Drive model from 1965 features a 35mm Hardlex-Coated Steel case. With its 19mm lug width and 14.3mm profile, it sits comfortably on most wrists. [seikata-wm-cb94857b0414]

Also known as: Monster, Sea Horse

Specifications

Movement
Spring Drive
Case Material
Hardlex-Coated Steel
Case Width
35mm
Case Thickness
14.3mm
Lug Width
19mm
Crystal
Hardlex
Bezel
Bidirectional
Water Resistance
30m
Dial Color
Green
Jewels
30j
Frequency
28,800 bph
Power Reserve
46 hours
Year
1965

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seikata-wm-cb94857b0414