Aha Not quite the same , but similar. I have a 49 meteor grille and 49 and 50 Mercs here from my friend's stuff. I bet it's from one of those. Thanks so much.
I lived in St Albert for quite a few years. Still go for coffee at Tim's on fridays with a bunch of "old" car guys.
Looks like a deflector that goes on the bottom side of a hood to direct air through the radiator. You can see the staple holes where the weatherstripping went.