Seiko Cal. 4420 - 421

The Seiko 4420-421 represents an important milestone in Seiko's 1975 lineup. With its 19mm lug width and 8.0mm profile, it sits comfortably on most wrists. [seikata-wm-683ef5336bc6]

Also known as: Bellmatic

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

34mm

Case Thickness

8.0mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

30m

Dial Color

Black

Jewels

33j

Frequency

28,800 bph

Power Reserve

57 hours

Year

1975

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