Found an article that mentions them, but no real source of information [1]. The articles says, "Based on a number of things I see in this photo of classic AFL/NFL pins, I’m guessing these were produced between 1968 and 1971... The reason I’m guessing ’68 at the earliest is that we have a Cincinnati Bengals pin, and they didn’t start play in the AFL until that year. Likewise, the Boston Patriots changed their name to New England Patriots in the spring of 1971, so it seems unlikely that these were produced after then..."
Looks like you have all with the exception of the Cincinnati Bengals.
[1] https://www.grayflannelsuit.net/blog/heres-neat-late-60s-nfl-afl-pins