Custom Replica Acme Throwback Jersey hand signed by Green Bay Packers Super Bowl XLV Champ CLAY MATTHEWS. The signature is in black paint pen. This jersey was signed at a private signing with us and would make a great addition to any Packers collection! The jersey size is XL and all letters and numbers are sewn in. This autograph is guaranteed to be 100% authentic and will include a COA from JSA (James Spence Authentication).