Seiko Cal. 4427 - 978

The Seiko 4427-978 represents an important milestone in Seiko's 1988 lineup. Powered by the 4427 caliber with 31j jewels beating at 21,600 bph, it delivers a 45 hours power reserve. [seikata-wm-f438e69b9490]

Also known as: Helmet, Sportsmatic

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

35mm

Case Thickness

15.9mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

130m

Dial Color

Navy

Jewels

31j

Frequency

21,600 bph

Power Reserve

45 hours

Year

1988

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