Charlie,
Most peculiar. Up till the 1934 season, it was the OHV models that had the brakes on the right-hand side. The steering stem is indeed S6. If the girder blades were from an OHV model, they would have to be 1926-29, modified to add the headlamp mounting (they were using headlamp irons that plugged into tapered sockets in the lower fort stem at the time.) This does not seem to be the case here, as the top clip seems to be part of the upper girder lug, which is what Douglas did when they went to the four-point headlamp mounting. Does that clip look original or like it was added?
OHV models from 1928-33 are out, as they used a variation of the DT fork, which had a different shape girder blade. Then as mentioned, 1934-35 the brake was on the left-hand side, same as the side valves.
I will have to dig out a set of S6 forks to see if it is possible to assemble the girders on the wrong sides. The axle lugs would be shifted to the outside, but that could be overcome with axle spacers. Are the axle lugs offset in towards the hub (normal) or away?
-Doug
-Doug