Denny, did you have any odd or residual smells when running your 'rebuilt' heater switch on low the first time?
I bought one awhile back that was supposed to be NOS and it was in almost perfect shape so I had no need to question it. I did think the coating looked off in color compared to my original but I assumed it was just because mine was well worn. When running on low I can smell it, not quite a burning scent, but close. I'm now fairly certain it was a new (or close to new) switch that someone may have broken the coating on and replaced it with something that was more resin based so they could sell it as NOS.
Jeff