Seiko Cal. 6643 - 770

Seiko 6643-770

The 6643-770 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6643 caliber with 24j jewels beating at 21,600 bph, it delivers a 52 hours power reserve. [seikata-wm-9c976058bf60]

Also known as: Tuna, Silverwave

Specifications

Movement
Automatic
Case Material
Two-Tone
Case Width
38mm
Case Thickness
10.0mm
Lug Width
20mm
Crystal
Acrylic
Bezel
Fixed
Water Resistance
30m
Dial Color
Cream
Jewels
24j
Frequency
21,600 bph
Power Reserve
52 hours
Year
1992

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