Seiko Cal. 4420 - 377

This Solar model from 1980 features a 34mm Hardlex-Coated Steel case. Powered by the 4420 caliber with 36j jewels beating at 21,600 bph, it delivers a 56 hours power reserve. [seikata-wm-5b7c455b24c6]

Also known as: Helmet, Sportsmatic

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

34mm

Case Thickness

11.9mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

White

Jewels

36j

Frequency

21,600 bph

Power Reserve

56 hours

Year

1980

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