Seiko Cal. 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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