The box shows it being shipped to a dealer in Antwerp, Ohio (not NY), and the Tag in the next picture says H-02-47, which I take to mean built in February 1947. The part number at the lower right of the box (3rd pic) is hard to read, but appears to be a lower number than shown in the 1929-1954 Chevrolet Master Parts & Accessories Catalog (screenshot attached). Note that it doesn't include a price for the '51-'52 Passenger Airflow heater, which suggests to me that the PN on the box was superseded by the Catalog publication date of 1954.
It might show up in the
GM Parts Wiki, which could give you some more info.
I don't think it's a Canadian heater, either., but it's a good find.
