My German is way rusty, and this is full of words I don't know, but from what I can gather, these were part of a scheme to boost the economy during the Third Reich. "Badges" were made by various artisan/craft guilds(?) on particular days set aside for their production. This was supposed to give them some guaranteed work. Then they were (I think) bought by the government, and sold to people on the street as a way to raise money for other things, in the same way that...do people sell red poppy pins in the US? I can't even remember now, I'm even blanking on their purpose. Anyway, they were tokens of the fact that people gave money to help a cause. It mentions the German Red Cross, for instance. I suppose you could then display them in the window and show all the people what good Germans you are.
I don't know why I'm attempting this rather than let someone who really does know German give a synopsis! You probably shouldn't take any of that as fact, I could be wrong anywhere or everywhere.