Add to Favorite Sellers. Don Mattingly New York Yankees Autographed Rawlings Pro Black Bat – Fanatics Authentic Certified. This bat has been personally hand-signed by Don Mattingly. It has been obtained under the auspices of the MLB Authentication Program and can be verified by its numbered hologram at MLB It also comes with an individually numbered, tamper-evident hologram from Fanatics Authentic. To ensure authenticity, the hologram can be reviewed online. Due to quantity levels, we do at times list a stock image of the product. This is done to standardize and expedite the listing process and only applies for merchandise that is comparably identical. Major League Baseball Authentication, Fanatics Authentic.