The 1939 US Card Collectors Catalog shows "521" for Baseball Series, white borders. It wasn't Until 1946 that it shows Baseball Series white border "522". A cursory look (I will look better later) through Supplements from 1940,1941,1942,1943 and 1944 don't show the addition. I am not sure a 1945 was made but I don't have it if it was. I will look through more notes.....(it does show Hustler as a back....which is kind of neat)
