Seiko Cal. 7138 - 636

The Seiko 7138-636 represents an important milestone in Seiko's 1965 lineup. Powered by the 7138 caliber with 24j jewels beating at 28,800 bph, it delivers a 43 hours power reserve. [seikata-wm-25d81a7a5d90]

Also known as: Bullhead

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

43mm

Case Thickness

9.6mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Burgundy

Jewels

24j

Frequency

28,800 bph

Power Reserve

43 hours

Year

1965

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