Seiko Cal. 6643 - 188

The Seiko 6643-188 represents an important milestone in Seiko's 1977 lineup. Powered by the 6643 caliber with 21j jewels beating at 36,000 bph, it delivers a 42 hours power reserve. [seikata-wm-6926805ac98d]

Also known as: Tuna, Flighty

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

14.1mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

70m

Dial Color

Champagne

Jewels

21j

Frequency

36,000 bph

Power Reserve

42 hours

Year

1977

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