I have a few decks of old cards I'm trying to identify. I'd love to find out if they were worth something as if they are I won't use them, but One has an area code consisting of only a single digit, one has us playing card Co. Windsor ontario on it and I am sure they are old. they are open but they don't even look like they were used....
The advertising deck - that's not a "one-digit area code," I don't think. I suspect it's just a five-digit phone number, hyphenated much like how seven-digit numbers are hyphenated today, to make them easier to remember. An area code would likely have been given in parentheses.
Back when I was a kid, even though we had seven-digit phone numbers, area codes were so large, they often didn't bother including area codes on ads - they were intended for local distribution only and people just knew that if you were from a specific city (in this case, Windsor, British Columbia), that you had a specific area code. Today, with so many devices requiring phone numbers, there's a lot of overlapping codes, and that doesn't even begin to account for mobile devices that people take with them from location to location as they move around. That five-digit phone number must be from WAY back in the early days of dialed telephones!
They look like really interesting finds. The top two decks are clearly from Canada - depending on their age, they might even have been printed in Canada.
I wish I had more info for you, but that's all I've got.