That is not the Limoges mint mark. That is the cow mint mark, the coin was minted in Bearn at the Pau mint. In that condition I would estimate value at around $50-$60.
Mine is a little different, with the Limoges mint mark. I got it for $45, which is probably what it's worth.
I guess some of the lettering on the front says that he ruled Bearn and Navarre, and France, of course.