NICK MASON Signed Pink Floyd WISH YOU WERE HERE LP Cover Beckett COA. The most respected autograph authentication experts in the world have teamed up with one of the most respected brands in collectibles. Beckett Authentication Services (BAS) is led by renowned autograph expert Steve Grad of Pawn Stars fame, who has spent the last 15 years as the principal authenticator for PSA/DNA. During his tenure, Grad used his expertise…