Larry Bird Signed Sports Illustrated Magazine 1st Cover 11/28/77 CGC 5.0 JSA

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

James Spence Authentication (JSA)

How authentication works, in full