Rob: You are correct! It
is HANCO, a pennant maker from New York City apparently, as confirmed by this label from a vintage Seaworld pennant I just came across. (See:
https://www.ebay.com/i/142667782228?chn=ps)
Suffice it to say, I had never heard of them before.
I guess the logo is supposed to be a painter's palette, with a smaller pennant draped across it emblazoned with the name "HANCO".
Curious if HANCO ever made any other sports pennants beyond those AL/NL minis, which seem to have been made in the early 1960s...?