For info on old Schwinns, there are some very knowledgeble folks on the Classic and Vintage forum. Bob Hufford and Sierra (BF members) have put together a very nice website on old Schwinns, including serial number info that could help you date the bike: www.geocities.com/sldatabook/serial.html Also, check out the info on Sheldon Brown's site on the electroforged Chicago Schwinns, it's very interesting reading-