Nice pin I never saw before. Robert, "ambulanter" is a false friend in that case,although high chance of the words origins somewhere in the care-taking sector.Here it is the association of Schausteller,Schauhandelsgewerbetreibende etc.-people that made a living of something best described by the Munich Oktoberfest:basically anybody doing business there is to be considered a ambulanter Gewerbetreibender,these were travelling salesmen doing business only at certain places like Volksfeste etc..