Yes, prewar cards are 1941 and earlier. Rationing of items in the US started in December 1941 and increased through 1942 to support the war effort. Production of baseball cards between 1942-1945 would have been seen as a luxury and contrary to the war effort.
Even by his strict definition, World War 2 didn't start until September 1939, so that would have been after most, if not all, 1939 baseball sets were produced. Even in England rationing of paper didn't begin until the summer of 1940.
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