Seiko Cal. 4438 - 158

The Seiko 4438-158 represents an important milestone in Seiko's 1976 lineup. Powered by the 4438 caliber with 29j jewels beating at 28,800 bph, it delivers a 46 hours power reserve. [seikata-wm-656dd6319ba8]

Also known as: Helmet, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

34mm

Case Thickness

13.7mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

140m

Dial Color

Navy

Jewels

29j

Frequency

28,800 bph

Power Reserve

46 hours

Year

1976

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