Looks like it was shot in 1937 (only year Johnny wore a number that started with a 2 with the Reds). Definitely printed sometime between then and 1948 when Burke suffered a career-ending heart attack and Brace took over the archives and day-to-day operation.
Most likely printed between 1937 and 1939, but I need to continue my cataloging of Burke stamp styles to include more samples before I could say that definitively. That's where the evidence is pointing at this time though. Someday I'll be able spare the time to pick that project back up. Anyone want to sponsor the research?
P.S. Thanks for the shout-out, Curt