That's a great pickup. 1941 is the earliest ASG pennant that I'm aware of.
In addition to the one you've found, I've catalogued this mini pennant from 1941. There's also these other 2 that I have listed as 1940s (but no specific date).
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Working on the following sets: 1916 and 1917 Zeenut, 1954B, 1955B, 1971T and 1972T
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