SANDY KOUFAX SIGNED AUTO ONL BASEBALL LA DODGERS HOF LEGEND GRAD AUTHENTICATION COLLECTIBLE MEMORABILIA

Every item in our collection is authenticated before listing. Each purchase includes a Certificate of Authenticity card and a tamper-proof dual hologram sticker - one on the item, one on the COA card - with matching serial numbers. Backed by our lifetime guarantee.

Our authentication process

GRAD Authentication is an independent third-party authentication service for autographed memorabilia. Its certificates of authenticity are backed by expert examination of the signature against exemplars, and are accepted by dealers and collectors.

Your GRAD COA includes a unique certificate number you can verify directly on their website.

Learn about GRAD authentication