Mystery partially solved. We dug it from under 20 or so 750 frames, honeysuckle vines, two copperheads and knee high weeds. It is an F frame, has the fork lock in the neck and the vin tag is riveted to the frame rail and not the neck. I thought the horn mount was on the left but it is on the right. The object I thought was the horn is actually an electrical connection box. Stock or owner added I am not sure. I think this might be a French import. Here's a few pictures taken when I was dodging a really upset copperhead.