If you want a professional "Quick Opinion" from an authentication company just to be sure we know what we are talking about, you can get one from PSA/DNA or Beckett for $10.
I know it is disheartening to find out something is not authentic.
I bought MANY bad Mantles, Dimaggios, and Williams in the late 1990's on Ebay with worthless LOAs.
I had to write off thousands of dollars because it was a few years before I actually studied autographs enough to know real from fake on those autos.
At least it did not cost you $300 to get bad news.
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