ROBERTS RM20 AM/FM RADIO TUNING ASSEMBLY.   

This assembly consists of a metal frame supporting the illuminated tuning scale, a pair of channel change buttons, the illuminating bulb and the tuning drive. The tuning pulley is attached to a tuning capacitor encapsulated in a clear plastic case. There is no printed circuit board associated with this assembly but the unit has cropped leads which identify the connections to the rest of the radio. Everything detailed above appears to be in good working order and the tuning mechanism is clean and seems to work well. A print out of the circuit diagram and the layout/parts list is included from radiomuseum.org.