I was asked by a friend in St. Louis if I would help liquidate a collection of sports items.
One of the items is a baseball with Mickey Mantle autograph. There is a hologram sticker on the ball with UDX 24613. Does anyone know what this means? I've looked online and cannot find anything other than Upper Deck sticker which is different. Is this an authentication of some kind.
Any help is appreciated. I have attached photos.
authentic Mantle with Upper Deck sticker.
Thank you so much.