Seiko Cal. 4420 - 430

The Seiko 4420-430 represents an important milestone in Seiko's 1980 lineup. Powered by the 4420 caliber with 18j jewels beating at 28,800 bph, it delivers a 43 hours power reserve. [seikata-wm-4a908eb7b0cb]

Also known as: Sumo

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

37mm

Case Thickness

12.0mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

70m

Dial Color

Champagne

Jewels

18j

Frequency

28,800 bph

Power Reserve

43 hours

Year

1980

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