First Bullets made in 1939 say "Hi-Speed" on bypass ,1940 "Phantom Motors " on bypass, 1946 4 bolt mag case, 1947 model 100 stamped under engine also came out with special glow head , nothing on 1948 , 1949 glow engine ,no provision for timer or cam. Early ones in good condition & missing nothing , $100.00 to $175.00 . Later ones $100.00 to $140.00. Who knows on E-bay & again condition is every thing ! MAX H.