According to Anderson book first made in 1942 as Whirlwind, Curtis - Wright made them change name. Yours looks like a 1945 or later . 1946 called Super Hurricane 24, 1948 last ignition. 1949 Hot Top 24, glow . MECA price 125.00 to 210.00, E-bay 82.00 to 213.00. Madewell 49, 1946 ignition,1949 glow. MECA 110.00 to135.00, E-bay 164.00. O&R 60, sideport, to 1949, MECA 100.00 to 200.00, E-bay 280.00 Front intake 1950,110.00 to 200.00, E-bay 178.00 .1952 purple head 275.00 to 325.00. The O&R is a tough one with out more info, had a good picture could maybe narrow it down more. MAX H.