Seiko Cal. 6643 - 638

Seiko 6643-638

The 6643-638 is a sought-after Solar piece from Seiko's golden era. Powered by the 6643 caliber with 32j jewels beating at 36,000 bph, it delivers a 55 hours power reserve. [seikata-wm-2b0c15d41dfa]

Also known as: Bullhead, Bellmatic

Specifications

Movement
Solar
Case Material
Hardlex-Coated Steel
Case Width
36mm
Case Thickness
8.4mm
Lug Width
21mm
Crystal
Acrylic
Bezel
Coin-Edge
Water Resistance
30m
Dial Color
White
Jewels
32j
Frequency
36,000 bph
Power Reserve
55 hours
Year
1972

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