Seiko Cal. 6638 - 559

Released in 1965, the Cal. 6638 with design code 559 was part of Seiko's domestic market collection. With its 21mm lug width and 14.0mm profile, it sits comfortably on most wrists. [seikata-wm-11d7d2cf95dc]

Also known as: Helmet, Crown

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

34mm

Case Thickness

14.0mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Black

Jewels

19j

Frequency

21,600 bph

Power Reserve

64 hours

Year

1965

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