Rollie Fingers Signed Oakland Athletics Jersey (Beckett) 3xWorld Series Champ AsCustom on field style jersey. Everything sewn on, size XL. Hand signed in silver paint pen by Rollie Fingers (HOF). 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 that verifies the authentication on the Beckett website.