Jacques Plante Hockey Card 1951
Royal de Montréal / Montreal Royals
Quebec Senior Hockey League
Laval Dairy Card #92
The cards witnessed limited regional distribution and as for mint cards, a mere 2% of the total population rank as high with none higher.
We can speculate it was never publicly circulated as these cards are thin and prone to wear and tear even from minimal handling. Graded PSA Mint 9.