Seiko Cal. 4431 - 721

Seiko 4431-721

This Hand-Winding model from 1976 features a 34mm Two-Tone case. With its 19mm lug width and 9.8mm profile, it sits comfortably on most wrists. [seikata-wm-d8e31dada807]

Also known as: Monster, Tuna

Specifications

Movement
Hand-Winding
Case Material
Two-Tone
Case Width
34mm
Case Thickness
9.8mm
Lug Width
19mm
Crystal
Sapphire
Bezel
Coin-Edge
Water Resistance
140m
Dial Color
Green
Jewels
26j
Frequency
21,600 bph
Power Reserve
69 hours
Year
1976

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seikata-wm-d8e31dada807