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Marks Brothers Mark Clayton & Mark Duper Signed Miami Teal Football Jersey (JSA) Multi-Signed Larry Johnson is one ofThis custom stitched football jersey has been personally hand signed by Mark Clayton and Mark Duper 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 Mark Clayton and Mark Duper and authenticated by JSA Includes a Witnessed Protection Program tamper proof