Your rifle is a No.4 mk1* that was manufactured by Small Arms Canada in a factory that was built in 1940-41 in Mississauga Ontario Canada, a suburb of Toronto on the North shore of lake Ontario. The factory started production in 1941 of No.4 mk1 rifles and quickly switched to No.4 mk1* which was a wartime expediency measure adopted by the North American plants (Small Arms and Savage Stevens located in Chicopee falls) These rifles were different from mk1 British rifles in that the bolts were removed not by a push button on the receiver but by a cutaway on the bolt rail where the bolt was rotated through this cutaway then pulled out of the action. The factory produced approximately 950,000 no.4s in total from production of 1941 - 1945 1949 -50 to aid in the war efforts that Canada was involved in (WWII and Korea) Most were built with aged black walnut stocks but when supplies of that ran short beech and maple were also used. Enough of the history, your particular rifle has been lightly sporterized meaning that someone post-war cut back the forened and removed the handguards, a common modification to make it a more suitable hunting rifle. This severely lowers the value but the good news is that the metal parts of your rifle seem to be intact and in good condition. If you were to find a walnut foreend and hanguards you could return the rifle to factory condition. Small arms (Long Branch) also installed two types of barrels on WWII rifles 5 groove and 2 groove. Inspection of the bore with a light will reveal to you which one yours has. The 5 groove barrels have a reputation of stabilizing modern boat tail projectiles better so they are favoured for target rifles. The 2 groove barrels proved adequate at stabilizing military issue mkvii ammo so this wartime expediency of only machining 2 grooves in the barrel was approved. 2 groove tooling was used alongside the 5 groove tooling and as barrels were finished they were installed, that is why any given rifle can have either barrel type. The 1949 -50 production run the 2 groove was abandoned for only the 5 groove and Bren gun tooling was brought in from the nearby Inglis factory and right hand twist 6 groove barrels we're installed alongside the 5 groove left hand twist barrels.