7x54 with "JF" before of the unknown SN , phosphat finish
http://www.naturabuy.fr/MAS-FOURNIER-CAL-7X54-item-3067185.html

not a textbook Mas 36 hunting rifle this 300 savage was made probably some times later with old parts and a new made barrel
http://www.naturabuy.fr/mas-36-300-savage-item-2784916.html