Jack Brabham, Graham Hill and Jackie Stewart-signed World Sporting Club dinner menu, the signatures of the three Guests of Honour in ink upon the fron

Jack Brabham, Graham Hill and Jackie Stewart-signed World Sporting Club dinner menu, the signatures of the three Guests of Honour in ink upon the front cover of the Dinner-Boxing Evening Menu / Programme held at Grosvenor House in London's Park Lane on Monday 23 March 1970 Earlier that month Jack Brabham had won the South African Grand Prix to became the only driver ever to win a F1 Grand Prix in three separate decades: the nineteen-fifties, sixties and seventies.