another ex 7x54 or 7x57 rechambering to 284 win
its the rifle No.837, notice the original caliber detail on the rifle was carefully changed to 284 Win. the other mas in 284 Win I have linked above with the number 157 still have the "7x57" on the left side of the magazin.

http://www.naturabuy.fr/MAS-36-FOURNIER-CAL-284W-item-1618117.html