Seiko Cal. 4431 - 738

The Seiko 4431-738 represents an important milestone in Seiko's 1979 lineup. Powered by the 4431 caliber with 28j jewels beating at 21,600 bph, it delivers a 71 hours power reserve. [seikata-wm-2fe90954bd45]

Also known as: Helmet, Arnie

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

36mm

Case Thickness

12.7mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

150m

Dial Color

Silver

Jewels

28j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1979

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