No expert here, so take it for what it's worth, but the Seaver was probably signed later than the others, hence the different pen. To me, it simply looks like a rushed version of his signature. The 'T' and 'S' are pretty similar to autos I got from Tom Terrific through the mail back in the day, as well as an autograph on my mitt (which has since faded) that was gotten in-person at a celebrity softball game.
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