A Miami Dolphins Riddell Throwback Full Size Replica Helmet hand signed by Dan Marino & Mark Clayton. The item and signatures are in excellent condition. Mark is a 5x Pro Bowler, 3x All Pro, and is a member of the Miami Dolphins Honor Roll. Dan is a 9x Pro Bowler, 1984 MVP and is a member of the Miami Dolphins Honor Roll. AUTHENTICATION: The item is accompanied by a Certificate of Authenticity - Serial Numbered and Databased Hologram - Photos of Dan and Mark from their Respective Signing.