A Brief History of the Marque
Koch Motorad-Center manufactured sidecars in Essingen near Aalen. They advertised sidecars suitable for BMW R 69S, R67, R50, R27, and R75, and in the 1980s their top of the range model was the K100 Royal Sport.
Their catalogue included classic and vintage models, and the firm also supplied spare parts including windscreens for these.
In later years the workshop moved to Wanfried, and when Koch died his son Maximilian took over.
Sources: Dreiradler ; Hal Kendall
N.B. There was a famed Czech designer who built sidecars, J.F. Koch. See Praga.