well, the current bid is about 33 dollars :) personally I thought that the guy who apparently is trying to sell it simply took some photo of freddie's autograph from another site and put it as his offer. By the way have you noticed the spelling? - fredi mercury :) lol
It's hard to say, really. I would say it's fake (look especially at "r" and "dd" in "Freddie") although the word Mercury looks quite good to me. But I wouldn't buy this.