In the 1950s, Parkurst was one of the big names in hockey cards -- as well-known as Topps and O-Pee-Chee would be to a later generation of collectors (or Upper Deck and Score to an even later generation).
Parkhurst Products was based in Toronto and began making hockey cards in 1951. It faded from the scene in the mid-1960s (the brand has recently been brought back, but the original company is long-gone).
Since wrestling was so popular in Toronto and throughout Canada in the 1950s, it was a natural that Parkhurst would produce a line of wrestling cards. It made two sets -- a 75-card set in 1954 (numbers have a red background) and a 121-card set in 1955 (yellow background).
There had been many wrestling cards made over the years before Parkhurst got into the business, but they are the earliest Canadian cards that I've seen.
Today, the cards are frequently sold on eBay, and complete sets in good condition are highly sought-after collectors' items.
Because they were made by a Toronto company, there are several Maple Leaf Gardens regulars featured on the cards. Here are a few of the Toronto-based wrestlers who got their own Parkhurst cards: