Seiko Cal. 4430 - 255

This Spring Drive model from 1978 features a 36mm Hardlex-Coated Steel case. The Rotating bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-949dd8de28d2]

Also known as: Sumo, World Timer

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

14.5mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

120m

Dial Color

Green

Jewels

26j

Frequency

28,800 bph

Power Reserve

46 hours

Year

1978

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