Seiko Cal. 6643 - 657

Seiko 6643-657

The 6643-657 is a sought-after Quartz piece from Seiko's golden era. Powered by the 6643 caliber with 28j jewels beating at 21,600 bph, it delivers a 60 hours power reserve. [seikata-wm-526d072285d2]

Also known as: Tuna, Navigator

Specifications

Movement
Quartz
Case Material
Gold-Plated
Case Width
43mm
Case Thickness
8.7mm
Lug Width
20mm
Crystal
Hardlex
Bezel
Bidirectional
Water Resistance
130m
Dial Color
Burgundy
Jewels
28j
Frequency
21,600 bph
Power Reserve
60 hours
Year
1978

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seikata-wm-526d072285d2