This is my 1929 Model 19. It has engine number 42xxx and this engine left the factory part of a Model 24 on the 2nd May 1929 with frame number 37xxx. The number on this Norton's frame is 588 42xxx, so very likely the Model 24 engine ended up in the frame of Model 19 (or a Model 18 that was fitted with the taller frame, identified by the 588).
