Seiko Cal. 4428 - 936

This Hand-Winding model from 1971 features a 39mm Titanium case. It features a Black dial protected by a Hardlex crystal and offers 110m of water resistance. [seikata-wm-7c264d84b8b6]

Also known as: Sportsmatic

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

39mm

Case Thickness

9.5mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

110m

Dial Color

Black

Jewels

33j

Frequency

28,800 bph

Power Reserve

39 hours

Year

1971

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