Seiko Cal. 4431 - 561

Seiko 4431-561

This Hand-Winding model from 1978 features a 41mm Titanium case. With its 19mm lug width and 13.0mm profile, it sits comfortably on most wrists. [seikata-wm-35ee2a728291]

Also known as: Sumo, World Timer

Specifications

Movement
Hand-Winding
Case Material
Titanium
Case Width
41mm
Case Thickness
13.0mm
Lug Width
19mm
Crystal
Hardlex
Bezel
Bidirectional
Water Resistance
90m
Dial Color
Navy
Jewels
28j
Frequency
28,800 bph
Power Reserve
58 hours
Year
1978

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