Ellwood Epps Sporting Goods in Orillia, Ontario tells me that it's a
Russian Tokarev rifle re-chambered to .303 British.
Sorry there are no markings on the breech, the clip has a number (2665) and the bottom has three small diamonds with a dot in the middle. Thanks for the interest. Do you think the chrome action can be rechromed? It's a little pitted.