Unless it is Lefty Gomez or Ernie Lombardi, I think you're fine.
Most Zeenut collectors will recognize it for what it is, and but for a handful of stars, etc., there's a very small cohort of collectors that would pay a significant premium for an autographed Zeenut. Perhaps if the player passed away decades ago, but I'd leave it as is, as I take from your original message that you got it graded for your own collection vs. specific resale purposes.
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