Seiko Cal. 4420 - 372

This Spring Drive model from 1979 features a 46mm Gold-Plated case. Powered by the 4420 caliber with 23j jewels beating at 28,800 bph, it delivers a 39 hours power reserve. [seikata-wm-4b5990506ec4]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

46mm

Case Thickness

15.7mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

70m

Dial Color

Cream

Jewels

23j

Frequency

28,800 bph

Power Reserve

39 hours

Year

1979

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