SN 917 in 7x54 rechambered by Fournier http://www.naturabuy.fr/mas-fournier-7X54-item-2815612.html

barrel is make in 1947 and looks like there is a 7x57 stamp on it. the receiver have a clean 7x54 marking so probably take over by Fournier in the white and than completed with the rechambered barrel