Seiko Cal. 6640 - 484

Seiko 6640-484

The 6640-484 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6640 caliber with 36j jewels beating at 21,600 bph, it delivers a 50 hours power reserve. [seikata-wm-4b3dcaaa0eab]

Also known as: Tuna, Bullhead

Specifications

Movement
Spring Drive
Case Material
Hardlex-Coated Steel
Case Width
44mm
Case Thickness
9.6mm
Lug Width
21mm
Crystal
Hardlex
Bezel
Coin-Edge
Water Resistance
100m
Dial Color
Silver
Jewels
36j
Frequency
21,600 bph
Power Reserve
50 hours
Year
1990

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