I've come into an almost-new 70's French wheelset with a 5 speed simplex freewheel, and I have a dim memory of once seeing a simplex freewheel closing on ebay for something preposterous, north of $75 I think. I'm not looking to flip this part for a big profit or anything, but a friend gave me the wheels to put on a beater so I'd feel bad if they were actually valuable. Are some of these freewheels valuable if in VG or better, and if so how can one identify the collector's items?

Thanks for any help.