I think a quick note should be added that with extremely rare exceptions... unless someone paid very good money for a bike in the past, and took very good care of it, then it proably isn't worth much today.
I can't think of any bike that someone one could have ridden in a middle class neighborhood without gathering a crowd of all the neighborhood cyclists and being worth anything today... and even some that drew the oohs and aahs are pretty worthless... I remember drooling over a friends Peugeot... and my guess is that if I were to go back in time I would discover it was a U08.