What is the value of an original signed kurt cobain photo?

I have an 8 x10 photo that is hand signed by Kurt and its #22 of 50 for the actual signing, I want to know roughly what the value would be if anyone knows. I think my dad bought it for about $350? http://cgi.ebay.com/KURT-COBAIN-NIRVANA-SIGNED-8X10-AUTOGRAPH-REPRINT-123-/350463219932?pt=LH_DefaultDomain_0&hash=item51993c58dc this is a link to a copy of the same picture as the one I have, but mine is an original not a reprint =)