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David AtkatzYes, Gehrig's signature style changed considerably over the years. (There was even a very rushed, in-person "L Gehrig," which you have pictured above as well.) In fact, the presence or absence of the correct signature style for the time is often used in determining authenticity.
But note that in every single example you have shown, the first and last names lie on the same line.
The example in question is a forgery.