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Clay Matthews Signed Green Bay Green Football Jersey (JSA) MP-Olympics This is a pair ofThis custom stitched football jersey has been personally hand signed by Clay Matthews and authenticated by a top 3rd party authentication company. All autographed sports collectibles are limited! Order now to add this timeless piece of football memorabilia to your collection before its gone. Hand signed Football jersey autographed by Clay Matthews and authenticated by JSA Includes a Witnessed Protection Program tamper proof authentication sticker from