I've been offered a framed Possum Bourne picture, limited edition one of 500 blah blah

Just curious what price you think its worth ? size is 465mm x 390mm

I would have no hesitation in paying $500 for it.

Is it actually signed by him or just a printed signature? If singed I would think maybe $200-$500. Also stuff like this is meant to have some sort of authenticity certificate I think.

Who verifies these Authenticity Certificates?

Just curious, cause I had my WRX owners manual signed by Possum, and a spare steering wheel signed by Juha Kankkunen.

But I was told that they are useless, because there is no certificate of authenticity.

I don't care, because I only got them signed for fun and not to make a profit,

but I am concerned if I ever do pay good money for something, that I'm not being ripped off...