I've been told mine is a late 50 model and it looks like the same frame, minus the seat mount. Mine has an extra tube in the rear for a seat strut if I remember right. I think the serial number is just above the pedal crank hanger...4 digits...? Post that and I'm sure somebody can help you date the frame. If not, I'll try and decipher it. I just remember having trouble locating mine in the Schwinn serial database. That headtube is definitely an electro-forged Schwinn made frame though. Rear fender is the only thing Bobberish to me. Sheath mounting hardware is rigged, but works I'm sure. Pedals and choke control look added, tank is probably repro, but that's good if you plan on painting it. Seat has a pretty nice condition original cover that I'm envious of!