Cologne Petri steering wheel horn button

Rare Petri horn button with the coat of arms of the German city Cologne (Köln). The button is has little patina and age and for sure it can be mounted as is in a restored car. There is one little chip / damage on the side (see pic #4 and last picture). The diameter is 8 cm and the rear is stamped with date “KÖLN / 501.206 / Hella”. The horn button is made of plastic. It was original Made in Germany about 1957 for the Petri steering wheel. I am not sure for what kind it classic car it was made, but possible for Ford, DKW or VW made around 1957.