So well done if you guessed that this was the Canadian O-Pee-Chee version of this set from the outset, and not just after we showed the reverse. Though even then you had to hunt for it, for the reverse starts by saying the number of the card, the total number in the set, and then has the copyright symbol and "T.C.G.", for Topps Chewing Gum; it is only after this that "Printed in Canada" pops up. Though the rest of the text, outside the box, is a bit of a giveaway, as it is bi-lingual, in French and English, whereas the Topps cards only had the square panel on the back, but saying "Printed in U.S.A" with the instructions just two lines of small text immediately below that panel.
This Canadian version is much scarcer here in the British Isles, mainly because we had a set of identical cards, issued by A & B.C. Gum, in 1971, though they had blank backs, with the instruction panel printed on the front. You can see one of those as our Card of the Day for the 18th of July, 2023. In fact, both the Canadian and British sets were originally produced by the American company, Topps, and then licensed to overseas.
The Canadian packets tell us this was a true trade set, with "one stick bubble gum" - and, just like in the A.& B.C. version, they had "extra inside - foreign style money".