Seattle Mariners Bryan Woo Autographed White Nike Jersey Size XL JSA Witness

This piece is JSA Witness Authenticated — James Spence Authentication's highest authentication tier. A JSA representative was physically present at the signing, observed the autograph being applied, and affixed the numbered sticker on-site. The witnessed designation provides the strongest possible chain-of-custody evidence in the industry. JSA maintains an online verification system so you can independently confirm the piece in under a minute.

1. Locate the JSA Witness sticker on the item, and the matching certification number on the included Certificate of Authenticity.
2. Visit JSA's verification page at jsaauthentication.com.
3. Enter the certification number into JSA's lookup tool.
4. Confirm the match. The lookup will return the item details and confirm the Witnessed authentication — these should match the piece in your hands.

If you ever have any question about this item's authenticity, contact us directly at orders@gamedaysportsmemorabilia.com or 844-747-1658. Every item we sell is backed by our Lifetime Authenticity Guarantee: if any piece ever fails authentication by the issuing authenticator, we refund 100% of the purchase price for the lifetime of your ownership.