Need help to ID a bike. Dug out an old Schwinn out of a barn out from behind a bunch of chairs and tractor parts today. Has the winged Schwinn head badge. Can someone let me know what years Schwinn used the winged head badge? Its a single speed road bike, it's too dark now to look at serial number. ll post pics and serial number tomorrow, also got an old tandem but there is not a head badge on it. Thanks for the help.