Jason Alexander Signed "Seinfeld" 8x10 comes with a certificate of authenticity from Beckett.

Jason Alexander portrayed George Costanza, a neurotic and lovably flawed character in the iconic sitcom "Seinfeld." As Jerry's best friend, George's comedic misadventures and quirky personality became central to the show's success. Alexander's impeccable timing and delivery brought George to life, making him one of television's most memorable characters.