Pictured here is the original Ford service tool used by dealers to remove and install the special nut which holds the cam gear on the end of the camshaft. The cam nut wrench is Ford service tool number 5-Z-1832.
This is a forged steel tool which was originally cadmium plated. Modern reproduction tools are usually a fabricated socket made to fit the nut and driven by a 1/2 inch breaker bar or impact gun.