Luis Diaz Hand Signed Liverpool Shirt Private Signing COA. This is a 100% authentic item which comes with its own CERTIFICATE OF AUTHENTICITY. ABOUT A1 SPORTING SPEAKERS. We have been responsible for the sale of over 250,000 items in the past fifteen years. Every signed item comes complete with an A1 Sporting Speakers Certificate of Authenticity signed by one of our directors Terry or Freda Baker. We have been solely responsible for almost every genuine signature in the market place signed by. Pele, Steven Gerrard, Wayne Rooney, Sir Geoff Hurst, Sir Bobby Charlton, Jimmy Greaves, England 1966 World Cup Winning Team & many more. Terry & Freda Baker. Exclusive agents to Sir Geoff Hurst. Book Harry Redknapp, Sir Ian Botham, Matt Le Tissier, Teddy Sheringham and more. Tour promoter for Eric Cantona, Pele, Sir Geoff Hurst, Harry Redknapp etc. WE ARE PROUD TO HAVE REPRESENTED THE GREAT JIMMY GREAVES FOR THE LAST TWENTY YEARS OF HIS WORKING LIFE.