Canadian? 75x350R Case ID

I have a 75 x 350R shell case that I have had for a while, and am told is Canadian. The headstamp is: “75 MM M18 LOT 349 CL/C /|\ 1942 F/|\52”. The primer is stamped: CR/C 34205-2 6/42 M31 W/C [42]". Is this case Canadian or another commonwealth nation? Any info would be helpful.