This is a c1935 Model 20 Norton; open diamond frame, parallel pushrod tubes, 8" headlight and the lock on the toolbox at the bottom of the lid; and off course a two-port head, look carefully and you'll see the additional exhaust pipe on the left hand side of the machine that distinguishes this Norton from the Model 18. No silencers and a very American scene. Many thanks to Scott Henderson for allowing use of this photo that was originally published in his Flickr collection.