Seiko Cal. 6639 - 220

The Seiko 6639-220 represents an important milestone in Seiko's 1975 lineup. With its 18mm lug width and 14.9mm profile, it sits comfortably on most wrists. [seikata-wm-a661055ba4ce]

Also known as: Tuna

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

34mm

Case Thickness

14.9mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

100m

Dial Color

Cream

Jewels

24j

Frequency

36,000 bph

Power Reserve

51 hours

Year

1975

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