I am surprised that no one, especially on this forum, has made an offer.
Oh dear - I am off to ebay
A number of things if I can that may help you with where your at
Rare and valueable are often two things that get confused. Yes these don't come along that often primarily because they were not high end to begin with.
Add to that the condition and suddenly like most collectors of fine things, numbers start to run through your head and in this bikes case the cost to return it to some near new/good condition would be immeasurably more than the bike is worth.
Of course you thought you would try here first and that makes good sense but I would suggest if I maybe so bold, the offer you may expect may be well outside of what it is actually worth.
Anyway, I would suggest some clearer pictures may be helpfull of the frame as the condition from the current ones looks quite bad (possibly just the picture quality) and if no one has bitten your arm off then ebay or gumtree would be your next logical outlets
Good luck with your sale