Seiko Cal. 4438 - 135

The Seiko 4438-135 represents an important milestone in Seiko's 1976 lineup. Powered by the 4438 caliber with 20j jewels beating at 21,600 bph, it delivers a 55 hours power reserve. [seikata-wm-d62e1f6ea4f8]

Also known as: Helmet

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

12.5mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

30m

Dial Color

Green

Jewels

20j

Frequency

21,600 bph

Power Reserve

55 hours

Year

1976

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