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Rhett YeakleyWhat you have is the first type of HOF B/W postcards they made. They were produced by "National Base Ball Museum" from 1939-43, yours is the first type, made only in 1939, slight caption change on back from 1940-1943. Then Albertype produced the postcards from 1944-1950's, then they were replaced by Artvue which produced them until 1963. I believe that is when the Yellow ones began to be produced nearly uninterupted until the present day, 1970's Dexter Press ones were made for a short time but they were terrible for signatures and were discontinued.
-Rhett