This autographed custom on-field style adult XL jersey has been personally hand-signed and inscribed "MLB debut 7/4/2025" by Colson Montgomery of the Chicago White Sox.This autograph is certified by Beckett Authentication Services (BAS) Witness Certification. That means that a Beckett representative was present when this item was signed. It comes with the numbered authentication scannable hologram with a QR code card that verifies the authentication on the Beckett website.