Graham Hill signed 1973 Silverstone cover

Graham Hill signed 1973 Silverstone Silver Jubilee Year cover. 

British racing driver and one of the most accomplished figures in the history of Formula One. Graham Hill achieved his greatest success in the 1960s. He won the Formula One World Championship in 1962 with BRM (British Racing Motors) and again in 1968 with Lotus. Hill remains the only driver to have won motorsport's coveted Triple Crown: the Formula One World Championship, the Indianapolis 500, and the 24 Hours of Le Mans.