I’ll second that you can’t slap a year of issue on any undated pennant. But I think most of us here on the board can tell the difference between 1940s and 1960s blindfolded (just by feel). You can often get a good idea from other pennants made similarly that do suggest a date. Ad Flags used a thick cottony felt through the early 50s, as evident by their Phila A’s, Boston Braves, and STL Browns. There are some Bkyn Dodgers where the felt is thinner but still soft and essentially unable to be creased.
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