oK ok OK,,,,,,,,,,,,,,,,,Those rims,,,,,,,,,,,,,,,,,it seems in 1930 there was professional cyclist dude in Germany called
Karl Altenberger, who started making his own aluminum competition bicycle parts.
Apparently he registered a factory for the manufacture of such products in 1940, and when on to produce competition alloy rims for racing motorcycles as well. That is a very early frame that Paul got me, complete with the rear wheel(and it is the earlier small axle rear wheel/hub/brake plate and sprocket carrier job) . It is fitted with one of those rims. Not enough as proof. Although I am confident that three will be proof around somewhere.