[UKCardGuy]

Originally Posted by Domer05

This is definitely by WGN. The Day-Glo color palette, the multi-colored scroll lettering, and the bat-skewered baseball are all typical of WGN's designs offered beginning in the late 1950s and continuing on through 1970.

There's an otherwise identical variant of this pennant that's dated, "1961." There's also a newer, similar looking one by WGN commemorating "The Big Red Machine" Reds that must've been one of the last MLB pennants ever made by them at the decade's end.

Thanks for clarifying. And because a picture is worth 1,000 words...here's the dated variant of the WGN pennant and the 1972 Big Red Machine edition.