Seiko Cal. 6643 - 256

Seiko 6643-256

The 6643-256 is a sought-after Quartz piece from Seiko's golden era. Powered by the 6643 caliber with 17j jewels beating at 36,000 bph, it delivers a 59 hours power reserve. [seikata-wm-3982bb726c1d]

Also known as: Sumo, Navigator

Specifications

Movement
Quartz
Case Material
PVD Black
Case Width
45mm
Case Thickness
9.3mm
Lug Width
19mm
Crystal
Sapphire
Bezel
Rotating
Water Resistance
50m
Dial Color
Silver
Jewels
17j
Frequency
36,000 bph
Power Reserve
59 hours
Year
1973

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