Ludlow, do you have any other pictures of the bike? Passenger pegs, seat, tank, carbs, front wheel, rear fender, etc? You may have a later year bike with an early motor, or an early bike with a later front end... or any combination really. The numbers should be on the neck. If not, it might be a bike that someone lost the title for and removed the numbers off the neck, or stolen like someone else said. I'd be damn tempted to scrape some paint away from the neck to see if you can't find any numbers or traces of them being removed. Very fishy.