Seiko Cal. 6638 - 164

The Seiko 6638-164 represents an important milestone in Seiko's 1973 lineup. With its 21mm lug width and 10.1mm profile, it sits comfortably on most wrists. [seikata-wm-c46349a363e2]

Also known as: Helmet, Sea Horse

Specifications

Movement

Quartz

Case Material

Stainless Steel

Case Width

46mm

Case Thickness

10.1mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Burgundy

Jewels

21j

Frequency

36,000 bph

Power Reserve

59 hours

Year

1973

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