Rifle has a general air of "Darra" to it. I'm not very familiar with Enfield Martinis, but isn't 1915 "a little late" for a .577-450? And the rest of the markings seem hand struck. And there's something odd about the nosecap; looks like it is from a different model of Martini....
"Darra guns" have been leaking out of Afghanistan and Pakistan more than usual recently. Apparently money still talks up there. My son has seen in various Helmand marketplaces "Snyders," "Enfield 1853s," "Martinis," and all sorts of hybrids of parts made in Nepal, Belgium, England, and....Darra.
