I have not seen any that were clear cad or zinc. I have taken a bunch of these apart and there is always a nice sample of the original plating under the copper lamp socket and I have only seen gold plating.
Some later service replacements are made from galvanized sheet stock like the disc brake backing plates were.
Here is a shot of the galvanized lamp.
But never say never.
Mike
Last edited by m22mike; 06-03-2017 at 02:51 PM.
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