Seiko Cal. 6643 - 680

Seiko 6643-680

The 6643-680 is a sought-after Kinetic piece from Seiko's golden era. The Inner Rotating bezel and 41mm case give it a distinctive presence on the wrist. [seikata-wm-0374ee173d34]

Also known as: Tuna, Bellmatic

Specifications

Movement
Kinetic
Case Material
Hardlex-Coated Steel
Case Width
41mm
Case Thickness
14.3mm
Lug Width
20mm
Crystal
Acrylic
Bezel
Inner Rotating
Water Resistance
100m
Dial Color
Champagne
Jewels
32j
Frequency
21,600 bph
Power Reserve
64 hours
Year
1975

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seikata-wm-0374ee173d34