Seiko Cal. 4420 - 287

This Spring Drive model from 1967 features a 46mm Titanium case. Powered by the 4420 caliber with 22j jewels beating at 28,800 bph, it delivers a 43 hours power reserve. [seikata-wm-83b20d785c8f]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

46mm

Case Thickness

14.5mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

120m

Dial Color

Cream

Jewels

22j

Frequency

28,800 bph

Power Reserve

43 hours

Year

1967

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