Tried looking it up and it might be Canadian, but it might also be Chinese.
All it says is 9 MM 42 on the headstamp and "might" be boxer primed. My Grandpa had about 4 of 'em with an old .38 revolver (strange, right), but I know he didn't use it in 'em because I have the revolver.
I've included a picture of one of 'em. The ammo looks old and I might use the bullets for any reloading experiments, the cases would be a maybe since they look pretty old.