PITTSBURGH PIRATES GREGORY POLANCO SIGNED JERSEY WBC DOMINICAN REPUBLIC JSA AUTH COLLECTIBLE MEMORABILIA

Every item is guaranteed authentic. Each purchase includes an Autographia Certificate of Authenticity 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

Founded by James Spence, one of the world's most recognized autograph authenticators. JSA has authenticated millions of signatures across sports, music, and entertainment. Accepted by major auction houses, dealers, and collectors globally.

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