This trading card has been hand-signed in pen by Karl Mecklenburg. PSA/DNA has authenticated the signature and encapsulating the card for lifetime protection. The encapsulation process guarantees the card cannot be tampered with. Each PSA slab has a unique authentication code that is verifiable online. Prime One Sports is an online leader in authentic signed trading cards. PSA cards hold their value longer than non-encapsulated cards. Start your collection today with an authentic signature.