Seiko Cal. 6637 - 688

Released in 1967, the Cal. 6637 with design code 688 was part of Seiko's domestic market collection. With its 20mm lug width and 14.8mm profile, it sits comfortably on most wrists. [seikata-wm-c40fdfa61ce8]

Also known as: Sea Horse

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

14.8mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

130m

Dial Color

White

Jewels

17j

Frequency

21,600 bph

Power Reserve

72 hours

Year

1967

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