Thank you for checking out our store! We value each and every customer and want you to be happy with the purchase you are making. Up for sale is a Jerry Seinfeld and Jason Alexander signed Funko Pop from the hit show Seinfeld where they played the characters Seinfeld and Costanza. The autograph of this duo on this funko pop was authenticated by a team of experts at JSA so you can rest assured you are purchasing the real deal. We’d like to encourage you, our customer, to reach out to us if you come across any questions. We always take the time to respond to a message from our customers and we’re happy to hear from you! Listed With Mascot.