The vast majority of pieces in Halper's collection were authentic. Because a few of the higher-profile pieces were counterfeit, the entire collection has taken a somewhat unfair hit, as a result.
Re-post this in the Autograph Sub-forum on the Memorabilia side, and include photos of the ball. The members over there are every bit as knowledgeable as PSA or Spence. They will give you all the answers you seek.
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