Seiko Cal. 4427 - 721

The Seiko 4427-721 represents an important milestone in Seiko's 1973 lineup. Powered by the 4427 caliber with 35j jewels beating at 21,600 bph, it delivers a 71 hours power reserve. [seikata-wm-89cce3a74d71]

Also known as: Pogue, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

13.6mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

50m

Dial Color

Blue Sunburst

Jewels

35j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1973

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