Very Rare! Made of Unobtainium! 3 were made and I own 4! Sale ads

I'm interested in your $5 bill. Can you point out what makes yours rare? I just want to be sure I get what I pay for. Educate me. :-D

Oh, because it's MINE, of course!...and you MUST want it, right?...Any other $5 bills are phonys...mine is NOS!!!.. ;-)

If no-one buys it ,I'll shred it!!