Seattle Mariners Ken Griffey Jr. Autographed Black Nike Jersey – Size XL – Beckett BAS Witness
Authenticated By
- Beckett (BAS)
- JSA
- Fanatics Authentic
- Schwartz Sports
- MLB Authentication
- PSA/DNA
- Lifetime Authenticity Guarantee
Every item ships with a tamper-evident hologram and serialized Certificate of Authenticity, verifiable directly with the issuing authenticator.
- Regular price
- $599.99
- Sale price
- $599.99
- Regular price
-
$659.99
Celebrate the greatness of “The Kid” with this Ken Griffey Jr. Autographed Seattle Mariners Black Nike Jersey (Size XL). Personally hand-signed by the Hall of Famer and authenticated with Beckett BAS Witness Certification, this collectible jersey is a must-have for Mariners fans and baseball memorabilia collectors.
Key Features
- Hand-signed by Hall of Famer Ken Griffey Jr.
- Official Black Nike Seattle Mariners Jersey
- Size: XL
- Authenticated by Beckett BAS Witness Certification
- Perfect for framing, shadow box display, or memorabilia rooms
Player Facts
- Ken Griffey Jr.: National Baseball Hall of Fame inductee, Class of 2016
- 13-time All-Star and 1997 AL MVP
- 10-time Gold Glove winner, 7-time Silver Slugger, and 630 career home runs
- Beloved Mariners icon known for his sweet left-handed swing
Specifications
| Player | Ken Griffey Jr. |
|---|---|
| Team | Seattle Mariners |
| Item | Black Nike Jersey |
| Size | XL |
| Autograph | Hand-signed by Ken Griffey Jr. |
| Authentication | Beckett BAS Witness Certification |
| Condition | Mint / Bold Signature |
| Display Recommendation | Professional framing or shadow box (not included) |
Authenticity & Shipping
- Authenticity: Beckett BAS Witness – autograph signed in the presence of a Beckett representative
- Condition: Clean, bold signature on a pristine Nike jersey
- Packaging: Professionally packed to ensure safe delivery
- Shipping: Free U.S. shipping; international shipping available
How to Verify This Item's Authenticity
This piece is BAS Witness Authenticated — the highest authentication tier offered by Beckett Authentication Services. A Beckett representative was physically present at the signing, observed the autograph being applied, and applied the tamper-evident hologram on-site. The witnessed designation provides the strongest possible chain-of-custody evidence in the industry, and Beckett maintains a public lookup tool so you can confirm the piece independently in under a minute.
- Locate the BAS Witness hologram applied to the item at the signing event. The serial number is printed on the hologram itself.
- Visit Beckett's verification page at beckett-authentication.com/search.
- Enter the serial number into Beckett's lookup tool.
- Confirm the match. The lookup will return the item details and confirm the Witnessed authentication — these should match the piece in your hands.
