Seiko Cal. 6643 - 435

Seiko 6643-435

The 6643-435 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6643 caliber with 28j jewels beating at 36,000 bph, it delivers a 44 hours power reserve. [seikata-wm-a28fa4a2f476]

Also known as: Bellmatic

Specifications

Movement
Spring Drive
Case Material
Gold-Plated
Case Width
42mm
Case Thickness
8.0mm
Lug Width
22mm
Crystal
Mineral
Bezel
Rotating
Water Resistance
160m
Dial Color
Navy
Jewels
28j
Frequency
36,000 bph
Power Reserve
44 hours
Year
1969

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seikata-wm-a28fa4a2f476