I would love to, but everything I have on Rube is off-limits to public posting. There aren't too many genuine examples out there, that's for sure. Even the example in a well-known HOF autograph guide published in the early 1990's isn't authentic.
Sorry I can't help out with Waddell, but here's a copy of the only full-name version of Eddie Plank's signature that I've ever encountered. Notice how much less flamboyant this example is as compared to other versions.
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