This poster was on ebay recently, don't see too many from the outside towns from this far back.
I spent some time years back at the Peterboro (Peterborough as its more commonly spelled) Library and did the year of 1953 when they were running weekly shows - Oshawa Wrestling History - Peterborough 1953
I haven't had time to get back but the city was a regular stop for Tunney through the 1950's with Oshawa Promoter Pat Milosh handling the shows in 1952 and 1953 at the very least. Others ran the town too, Red Garner and his Central Canadian Wrestling Alliance, Gus Marmon and the Olympic Wrestling Club, and later Dave McKigney with his Big Bear circuit
For more on the Ontario scene see Maple Leaf Wrestling - Promoters in Ontario