Seiko Cal. 4443 - 643

Seiko 4443-643

The 4443-643 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 4443 caliber with 20j jewels beating at 36,000 bph, it delivers a 42 hours power reserve. [seikata-wm-8dfc5ad4d5e4]

Also known as: Bullhead, Silverwave

Specifications

Movement
Hand-Winding
Case Material
Hardlex-Coated Steel
Case Width
41mm
Case Thickness
9.0mm
Lug Width
19mm
Crystal
Hardlex
Bezel
Rotating
Water Resistance
120m
Dial Color
Navy
Jewels
20j
Frequency
36,000 bph
Power Reserve
42 hours
Year
1967

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