Seiko Cal. 7131 - 431

Seiko 7131-431

This Hand-Winding model from 1979 features a 45mm Titanium case. With its 19mm lug width and 8.0mm profile, it sits comfortably on most wrists. [seikata-wm-d228f1e93e54]

Also known as: Tuna, Baby Tuna

Specifications

Movement
Hand-Winding
Case Material
Titanium
Case Width
45mm
Case Thickness
8.0mm
Lug Width
19mm
Crystal
Mineral
Bezel
Rotating
Water Resistance
140m
Dial Color
White
Jewels
36j
Frequency
21,600 bph
Power Reserve
64 hours
Year
1979

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seikata-wm-d228f1e93e54