Julian,
Welcome aboard! My uncle had a wagon back around that time. Does your car have a button/switch on the floor like a dimmer switch that controls the radio bands or changes stations. I remember him doing that while we were riding down the street and I thought it was cool to be able to change stations without "touching" the radio. For all you younguns out there, believe it or not there was a time when we had never heard of remote controls.
Thanks for jogging my memory