Seiko Cal. 6636 - 438

This Spring Drive model from 1976 features a 44mm PVD Black case. Powered by the 6636 caliber with 29j jewels beating at 21,600 bph, it delivers a 49 hours power reserve. [seikata-wm-f98ba07f6cfc]

Also known as: Bullhead

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

44mm

Case Thickness

11.7mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

40m

Dial Color

Navy

Jewels

29j

Frequency

21,600 bph

Power Reserve

49 hours

Year

1976

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