I read on the other forum, that you have to look for post war period repros, but how true is that? Does anyone know anything about it? Front usually looks the same on them, but the rear side, has variety of finishes, and I think thats how these patches and in general, are definied as either genuine, or not. They come with stamps, or without. Some are very cheap for couple Euro, but there are ones that are priced for hundrets of Euro, even thousands.
I have only 3, and might get more of the common ones, but thats it. I wish I could get the metal ones, in pristine condition.