Seiko Cal. 4420 - 547

The Seiko 4420-547 represents an important milestone in Seiko's 1970 lineup. Powered by the 4420 caliber with 20j jewels beating at 36,000 bph, it delivers a 43 hours power reserve. [seikata-wm-8a68906887bd]

Also known as: Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

39mm

Case Thickness

13.2mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

100m

Dial Color

Black

Jewels

20j

Frequency

36,000 bph

Power Reserve

43 hours

Year

1970

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