Seiko Cal. 6639 - 635

The Seiko 6639-635 represents an important milestone in Seiko's 1981 lineup. With its 22mm lug width and 14.7mm profile, it sits comfortably on most wrists. [seikata-wm-dfb2b2e1c91c]

Also known as: Sumo, Panda

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

14.7mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

150m

Dial Color

Champagne

Jewels

32j

Frequency

36,000 bph

Power Reserve

51 hours

Year

1981

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