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The parts are just copper plated like the chassis.
Motorola made that set, with minor variations for about four model years. They made that same set with a metal cabinet, painted all kinds of fancy, decorator colors. The UHF tuner is really a convertor. You had to set the set on channel 5 and flip the lever to the UHF position.
The set shown, is probably the last of the bakelite models. IIRC, the earlier chassis didn't have the trap door for the 1B3. The chassis had to be removed to replace the 6AF4 tube. In this area, UHF was used a lot, so you were lucky to get 6 months out of a 6AF4.
The UHF tuner was either factory installed or dealer installed.
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