Here is a cool old headlight bulb that I used in the 39.
Original head light lenses have this number cast in them.
Check out the cad plated plug for the speedo reset button. in 1938 HD started using a magnetic speedo lock for police bikes. This required putting a 3/8 hole in the left side of the dash. If the bike was for police duty, it would have a little spring mounted reset knob riveted to the dash base and the hole in the dash would be left open. If the bike was or is a civilian bike, it gets this little plug installed. There are two little tabs on it that get bent over and hold it to the dash.


















































