Maybe this will kickstart a discussion on 'classics' ,which your Gilera definately is . Its hard to give a definitive answer to your Question as so much depends on condition . Some people seem to think obscure models are worth megabux and there are some ( me included ) who just like to poodle around the lanes on them and will pay a fair price for a nice bike . The best way to evaluate is to keep an eye on sites like this one and scan the ads in the classic comics for like models . I tend to ignore dealers in these kind of things as they all have a vested interest in promoting ''classic '' prices . Best of luck ,