Well you have to remember not everyone was lucky enough like yourself to have worked for Schwinn when these frames were sold. To you it's common knowledge because that was part of your job to sell these frames. Not to mention you had a copy of the dealer catalogs or at the very least access to it. He was smart enough to see he wasn't finding the info on the green cruiser frames so what did he do? He started asking questions to other ppl that were into the hobby until he found his awnser. I did the same thing, I don't have access to these 1980s Dealer catalogs so what do I do, ask here on the cabe.