Heres a full list of the drivers signatures on the plate clockwise from the top
Jim Clark
John Surtees
Bruce Mclaren
Stirling Moss
Jack Fairman
Graham Hill
Innes Ireland
Roy Salvadori
Ian Burgess
Trevor Taylor
Jack Sears
Jack Brabham

one of these early plates just turned up on Ebay for 500 British pounds so there must still be a few around. price seems a bit high mine was just a fraction of that. lucky me