PSA/DNA:PSA/DNA is a state-of-the-art autograph authentication service developed by Professional Sports Authenticator (PSA) of Newport Beach, California. Utilizing a specially synthesized DNA technology provided by DNA Technologies, Inc., PSA/DNA provides legitimacy to autographed collectibles and helps combat the problem of counterfeits. Professional Sports Authenticator (PSA) is the world's largest third-party grading and authentication service. Each signature submitted for autograph authentication is thoroughly examined by the foremost signature expert in the industry. Life long experience, a nationally recognized reputation, the largest exemplary file in the hobby and formal training in the field of Forensic Document Examination combine to offer the most reliable service to identify autograph legitimacy. The Letters of Authenticity that are generated are guaranteed to be accepted by any major sale house including most national sale houses (Christie's, Mastro Fine Sport, Grey Flannel, Hunt sales, etc), dealers, collectors and investors nationwide.Theopinion of the authenticators at PSA/DNA are respected throughout the hobby and are the authority when it comes to deeming a signature authentic. When you see PSA/DNA you can feel confident that you are receiving a genuine 100% Authentic signature.offer With 100% confidence. (check response).