Seiko Cal. 4438 - 729

The Seiko 4438-729 represents an important milestone in Seiko's 1967 lineup. Powered by the 4438 caliber with 23j jewels beating at 28,800 bph, it delivers a 61 hours power reserve. [seikata-wm-8935e0708ef1]

Also known as: Helmet

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

41mm

Case Thickness

13.0mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

90m

Dial Color

Blue Sunburst

Jewels

23j

Frequency

28,800 bph

Power Reserve

61 hours

Year

1967

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