That's a tough one. Figure any vintage bike is likely to need an overhaul (cables, housing, brake pads, R&R bearings, etc.) so I wouldn't necessarily make that a factor. If the NR components were all good, if the clincher rims were good quality period correct rims (like a Super Champion Gentleman or something similar), and if the chrome were excellent...maybe. You could probably get a nice paint job and decals for $500 but then you'd be into it for a grand and that's a lot of money. You will certainly run across a clean Professional for less as they do pop up from time to time. I would expect to pay $600-$700 for one in excellent condition (then still figure another $100 for an overhaul). Then again, it would probably have the original Fiamme red label tubular rims and if you wanted to build up a wheelset with clinchers for everyday riding you'd be back near that $1000 mark.