Seiko Cal. 6638 - 667

The Seiko 6638-667 represents an important milestone in Seiko's 1972 lineup. The Bidirectional bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-89331f7c0335]

Also known as: Bullhead

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

36mm

Case Thickness

12.1mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

60m

Dial Color

Navy

Jewels

34j

Frequency

21,600 bph

Power Reserve

45 hours

Year

1972

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