Looks like a resto-mod to me. I've seen cars painted in "special colors". Are they worth more? My guess is, that if it can be verified, it all depends on the choice of color and the buyer's desire for that particular color. I owned this car (Ya, I know not a Mustang, but an example) which was special order painted a company color. Not a desirable car and I sold it, with 36,000 verified miles, for $2,300.