Seiko Cal. 6639 - 797

The Seiko 6639-797 represents an important milestone in Seiko's 1978 lineup. Powered by the 6639 caliber with 34j jewels beating at 21,600 bph, it delivers a 48 hours power reserve. [seikata-wm-f19290007679]

Also known as: Sportsmatic, Crown

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

36mm

Case Thickness

12.2mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Black

Jewels

34j

Frequency

21,600 bph

Power Reserve

48 hours

Year

1978

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