Hank, My opinion is that all of the Walter Johnson autographs on this page are good. I lean in the direction of what others have posted that the team name is possibly in another hand and that the dates are in W.J. hand although I would not completely rule out the possibility that he wrote the team name also. He wrote a lot of handwritten letters and a quick review of the handwriting on some of those should close the case. Since the slant appears the same.
Also to clarify the fake HOF envelopes I've seen have never included anything except a signature.
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jim@stinsonsports.com