Burdick issued a 20-page supplement in July 1940, and smaller supplements in October 1941, and October 1942, but with the war going on, another catalog didn’t come out until 1946, thus starting the every seven-year sequence. - See more at:
http://www.sportscollectorsdigest.co....ksJmkVe7.dpuf
according to the sports collector digest
http://www.sportscollectorsdigest.co...atalog-in-1939
A nice guy named Leon mentioned as well