Mark McGwire 1984 Olympic Debut Signed July 31 1984 Ticket Stub PSA 90703716 USA

Authentication

Certified by an independent third party

We do not authenticate our own inventory. Signatures are examined by an outside authentication house — PSA/DNA, JSA or Beckett Authentication Services — and the certificate they issue travels with the piece. Autograph authentication is an opinion on whether a signature is genuine; it is a separate service from condition grading, which assigns a numeric grade to an item’s state of preservation.

Authenticated by

Professional Sports Authenticator (PSA)

Certificate number

90703716

How authentication works, in full