Can we get some pictures?
If it's as complete as you say it is I'll open the bidding at $20. I'll be completely honest, with a very few exceptions, old vacuums won't ever fetch you more than the price of a nice bottle of booze. However there is a corollary to that statement; it's rare to find one in such awful shape that you can't find someone to give you $5 or $10 for it just because, and vacuums are like cars inasmuch as if it works, you can always find someone who wants it simply for that reason.