Seiko Cal. 4420 - 666

This Spring Drive model from 1976 features a 46mm Stainless Steel case. Powered by the 4420 caliber with 20j jewels beating at 36,000 bph, it delivers a 37 hours power reserve. [seikata-wm-129096305d3c]

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

46mm

Case Thickness

15.7mm

Lug Width

18mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

90m

Dial Color

White

Jewels

20j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1976

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