Sicilian Cart

I had bought this cart from a man in Chicago some 30yrs ago, I was able to find some information on these carts through an article I found on the internet, (link) http://hubpages.com/hub/Art-Carts-of-Sicily-Craft-art-utility-and-genius-reflected-in-carretto-Sicilia

This is all the information I can find, I don't know who to contact to get a proper apraisal, so any help would be apreciated. Thanks!