The coin you picture is dated 1550, and if it is a douzain (size will tell you that) with that date it was minted at Nantes.
You've already got 1 thread started on this. There is no need to start another one. If you wish to know what the coin is worth, then ask in your original thread.
Not much really, you can look it up here - http://www.coinarchives.com/ and here - http://www.mcsearch.info/index.html
