Consensus is that it's Bobby Charlton's signature but I have no proof.
Autographed Editions First Day Cover Hand Signed Bobby Charlton
England 1966 World Cup Card Hand Signed Bobby Charlton - Manchester United
George Best Dennis Law Bobby Charlton Man Utd Football Legends Hand Signed & COA
Hand Signed by Sir Bobby Charlton 1968 E/CupFinal Limited Edition Print 56of500
Vintage Bobby Charlton Football Singed Collectible Ball Hand Sewn Fifa Matchball
MANCHESTER UNITED SIGNED PENNANT CHAMPIONS Bobby charlton Signed Alex ferguson
