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Karl Mecklenburg Signed Denver Broncos Throwback 75-96 Speed Mini Football Helmet (JSA) MP-Football This is a Blue JerseyThis officially licensed mini football helmet has been personally hand signed by Karl Mecklenburg 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. Speed mini NFL football helmet autographed by Karl Mecklenburg and authenticated by JSA Includes a Witnessed Protection Program tamper proof