Seiko Cal. 6640 - 964

Seiko 6640-964

The 6640-964 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 6640 caliber with 21j jewels beating at 36,000 bph, it delivers a 50 hours power reserve. [seikata-wm-d94fc3d51789]

Also known as: Bullhead

Specifications

Movement
Kinetic
Case Material
Stainless Steel
Case Width
45mm
Case Thickness
14.4mm
Lug Width
19mm
Crystal
Acrylic
Bezel
Bidirectional
Water Resistance
70m
Dial Color
Navy
Jewels
21j
Frequency
36,000 bph
Power Reserve
50 hours
Year
1983

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seikata-wm-d94fc3d51789