Seiko Cal. 4424 - 721

Released in 1973, the Cal. 4424 with design code 721 was part of Seiko's domestic market collection. The Rotating bezel and 43mm case give it a distinctive presence on the wrist. [seikata-wm-42d82da4ec11]

Also known as: Helmet, UFO

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

43mm

Case Thickness

11.1mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

30m

Dial Color

Cream

Jewels

30j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1973

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