Seiko Cal. 6643 - 637

Seiko 6643-637

The 6643-637 is a sought-after Quartz piece from Seiko's golden era. Powered by the 6643 caliber with 25j jewels beating at 21,600 bph, it delivers a 51 hours power reserve. [seikata-wm-6c31964ad017]

Also known as: Emperor, Arnie

Specifications

Movement
Quartz
Case Material
PVD Black
Case Width
39mm
Case Thickness
10.7mm
Lug Width
21mm
Crystal
Sapphire
Bezel
Bidirectional
Water Resistance
30m
Dial Color
Champagne
Jewels
25j
Frequency
21,600 bph
Power Reserve
51 hours
Year
1974

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seikata-wm-6c31964ad017