Based on research and recent Net54 feedback from a Jr. Griffey I recently shared, it appears authentic. Furthermore - from what I came across online, and I ask you not quote me on this - it is an early/mid career signature, likely '95 or earlier. I say this due to the left to right intro stroke to his "K", which seems to have disappeared in later years. What type of ball is it on? While not conclusive, this might provide some insight on when it was signed.
Please keep us posted with authentication - best of luck
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