Motorsport prints

What is the increase in value of a signed print over a non signed one, I am lucky enough to have three signed, 2 Dexter browns 250 GTO at Goodwood & P4's at Daytona)and a Fernley (sunset at LM also signed by D bell & Ickx)?
I do not wish to sell them but am curious.

I think it depends on the size of the Limited edition, if it has sold out, how many were driver signed etc. Perhaps the best place for a valuation is to try Alex Reade International. I think his website / contact info is alexreade.net

I once see a Alan Fernleay print for sale of Nigel Mansell winning the Indycar series title in 1993 at Nazerath USA that was signed by Fernleay , Mansell and Carl Hass for sale at £1000 !.......ive got one of those prints and i think i paid £125 ( unframed ) when they went on sale .

It was a limited edition of 1000 prints......i was amazed when i see one for sale for that price.

Sometimes, sold out limited editions go for crazy money on the secondary market. in 1991, I had just 60 prints of my Senna / McLaren painting 'Home Town Hero' signed by Senna and Ron Dennis. They were advertised at £195 in Autosport and sold quickly. A couple of years later I saw one in the classifieds in Autosport from a collector in Japan - up for grabs at £3900! I've no idea if he got that for it but if he did - bravo! Pity I have none left.

£3900 !....wow now that alot of money !....You could have retired in the sun if you had a few of them left Andrew !.