Seiko Cal. 6643 - 188

Seiko 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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