Georges Hamel , who signed his works Geo Ham , created his first poster for the event in 1933 .
Georges Hamel , who signed his works Geo Ham , continued through 1937 , the last race before a 10 year hiatus surrounding the war years .
Georges Hamel , who signed his works Geo Ham , created his first poster for the event in 1933 and continued through 1937 , the last race before a 10 year hiatus surrounding the war years .