Hi, so here's one of my initial attempts to play self "authenticator".  I found this Eisenhower TLS on on a fairly reputable auction site.  It's also PSA pre-certified (I think that's their new version of the auction letter).  To me, the signature has a lot of similarities with exemplars that I've found.  However, what I don't like is the "s".  In every single exemplar in Kenneth Rendell's book, and in all but one of the exemplars on PSA's website, the "s" in Eisenhower has no visible space inside the letter.  It looks more like a malformed, sloppy "i".  However, in this item, there is clear, visible space inside the "s", as there would be in more proper cursive.  So am I making a mountain out of a molehill or is this likely secretarial?