Autograph authentication for signed sports cards
From on-card autographs to signed slabs and bulk team sets, MAS authenticates signed sports cards across every era and sport — with witnessed certification and a publicly verifiable COA on every card.
Signed sports cards we certify
How to spot a fake sports cards autograph
Compare the flow of the ink
Genuine signatures show natural speed and pressure changes; traced or printed autographs look uniform and hesitant.
Check the signing surface
Many cards have slick coatings. Learn which sets were signed on-card versus via sticker autographs applied by the manufacturer.
Beware 'rubber stamp' and autopen
Repeating, identical signatures across multiple cards are a red flag for mechanical reproduction.
Insist on verifiable certification
A COA you can confirm in real time — like a MAS COA — protects you far more than an unverifiable sticker.
Questions about sports cards
How do I get my sports cards authenticated by MAS?
Submit online at mascertified.com/submit and mail your sports cards in, request an Instant Verification from photos, or have items authenticated live when MAS attends a convention or signing.
Does MAS certification add value to signed sports cards?
Verifiable certification gives buyers confidence, and MAS-certified items are actively bought and sold and widely recognized by collectors and dealers — which supports strong, consistent resale value.
What is witnessed authentication for sports cards?
Witnessed authentication means an MAS authenticator was physically present when the item was signed — the strongest standard in the hobby, with no opinion or guesswork.