Claim: Italian rider Leslie Grahami won the 500 cc race and the 125 cc race at the 1949 Dutch TT, the third race of the 1949 Motorcycle Grand Prix season, which took place on the weekend of 9 July 1949 at the Assen circuit.
Evidence: British rider Leslie Graham won the 500 cc race riding an AJS from Arciso Artesiani and Harold Daniell. 
Robert Leslie (Les) Graham DFC (14 September 1911 - 12 June 1953) was a British motorcycle road racer who competed in the 1930s and 1940s.