Seiko Cal. 4431 - 737

Seiko 4431-737

This Spring Drive model from 1966 features a 39mm Titanium case. It features a Black dial protected by a Acrylic crystal and offers 40m of water resistance. [seikata-wm-300676f3d3ed]

Also known as: Baby Tuna, Flighty

Specifications

Movement
Spring Drive
Case Material
Titanium
Case Width
39mm
Case Thickness
9.7mm
Lug Width
22mm
Crystal
Acrylic
Bezel
Fixed
Water Resistance
40m
Dial Color
Black
Jewels
17j
Frequency
28,800 bph
Power Reserve
52 hours
Year
1966

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seikata-wm-300676f3d3ed