Tom,
The "Flame Tempered" stamp near the certerbrand indicates definitively that this is a store model bat. An authentic model issued to the player would have "Powerized" stamped in the same spot. While Powerized-stamped bats can in some cases be purchased by the public, the lack of a Powerized stamp would indicate that it's certainly not a gamer, if that's where your question was leading. Also, P72 was not a model known to be ordered by Mattingly.
As for the signature, it does resemble a style that Mattingly has used in the past, but it is hard (at least for me) to say definitively that it's legit due to the angle that the photo was taken from.
R.J.
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