Some things never change, but it certainly seems like what's considered funny does change. These vintage cartoon postcards are probably from the late 40s, early 50s, and were sent by the Mystery Sender. In fact, the one on the lower left included a recipe for moonshine on the back!
They are not at all "politically correct", and I love the goofy double entendres in all of them. If you like this genre, check out Postcard Funnies. It's a blog with nothing but these kinds of postcards.