Does anyone know the changeover serial no. when 63's went from a wonderbar to an AM/FM radio.(I realize there are always exceptions but...) My 63 is just under serial #9200 and has a wonderbar. However it also has a radio shops label on it. On investigation all of the radio capacitors and the antena grounding wires routing/location suggest it originaly was equiped with an AM/FM radio. Any thoughts or similar occurances? Larry