The C845 might have been the first Zenith "Interlude" model but I have an H845 dated 1961 that is identical.
The one problem I have had to address on it was a worn-out bandswitch. I carefully cleaned and then re-tensioned the contacts using a chopstick.
I found another of the same model on the "free" table at an Antique Radio swap meet.
I soon found out why; It had dreaded silvermica disease.
http://videokarma.org/showthread.php?t=254601