Seiko Cal. 6643 - 639

The Seiko 6643-639 represents an important milestone in Seiko's 1994 lineup. Powered by the 6643 caliber with 34j jewels beating at 28,800 bph, it delivers a 39 hours power reserve. [seikata-wm-c7590301070c]

Also known as: Pogue, Crown

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

14.1mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

140m

Dial Color

Blue Sunburst

Jewels

34j

Frequency

28,800 bph

Power Reserve

39 hours

Year

1994

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