Seiko Cal. 6639 - 738

The Seiko 6639-738 represents an important milestone in Seiko's 1982 lineup. With its 18mm lug width and 8.5mm profile, it sits comfortably on most wrists. [seikata-wm-ea136a66ea8c]

Also known as: Sportsmatic, Sea Horse

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

36mm

Case Thickness

8.5mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

50m

Dial Color

Navy

Jewels

21j

Frequency

21,600 bph

Power Reserve

67 hours

Year

1982

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