Seiko Cal. 4421 - 100

The Seiko 4421-100 represents an important milestone in Seiko's 1978 lineup. Powered by the 4421 caliber with 26j jewels beating at 28,800 bph, it delivers a 39 hours power reserve. [seikata-wm-264bb7fabc21]

Also known as: Helmet, Bellmatic

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

38mm

Case Thickness

11.4mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

180m

Dial Color

Green

Jewels

26j

Frequency

28,800 bph

Power Reserve

39 hours

Year

1978

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