There are at least two constructions of the center stand, depending on the exhaust system. On the photo is the first construction for long pipes and short silencer. From 1954 they have changed the exhaust system due to new noise laws. To reduce the noise, they have to fit a longer silencer with shorter pipes. It was also required to construct a new center stand.
The part-number for the old center stand on my HOREX is: JFM 12-A GV.
I think there is a piece grinded down
The bottom in detail.
