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I think someone else here nailed it. We call things "post war" (essentially anything issued 1946 and later). Everything else is "pre-war" because there is no category called "war". There is certainly a gray area for cards issued between late 1941 and 1945 during the US involvement in the war. But then again, there weren't all that many cards issued during that time ('42 to '45), so I don't really care how you categorize them, but every card needs to fit somewhere, right?

For those going on a limb and stating that you wouldn't consider a card issued in 1940 or 1941 as "pre war", then what might you call them??? Certainly not "post war". Do you call those "vintage"? Each card needs a category. Please explain the cut-off.