As with everything the value depends on condition, matching numbers, etc. There should be a matching numbered bolt and stock just to start as the Frenchicon loved to number every visible part they could. As to value an 07-15 is a little more desirable as supposed to say just an Mle 1916 and Continsouza is a harder to find arsenal (it ranks up there with Tulle marked examples). Also if the stock has been refinished in any way it'll hurt the value as most don't want refinished pieces. Getting a couple of pictures posted here can help as well as it lets others who know the market well get a good close look at what you have.