I recognize it, i had a few badges with it on before, but dont have images anymore. The only pics i have are of a set of DVG (Deutscher Radfahrerverband) with it on.
Dont know who it is though. Best slap it up on this thread
Unknown Makers Marks on Parteiabzeichen
But i inspected and connected badges that i had in hand, and by no means do i mean that any badge that looks similar and has a rectangular pin plate -yet unmarked- must be from Paulmann. You would have to do that yourself, by taking good clear images like i do (and Mark now does as well, bless him )of the obverse of yours, and compare it to clear images of a Paulmann. In the book though, there are also many different Paulmann obverse designs shown, so it wont be as easy as your ABC, but if the interest is there, can quite easily be done.
Well it was certainly cut from the same master die, or at least the same working hub, as the design is identical. But who cut the dies? In all likelihood not Paulmann but a die cutter, in German a Prägewerkzeug Hersteller. Or it could have been Paulmann just cutting himself a new die, (it could also be the same die just 10,000 stamps later) this design is specific to them, and i have yet to see another maker marked badge marked with a different name, using this design.
Your badge is on the left, the right is a fully marked Paulmann badge.
Erno, pin plates, RZM marks, maker marks etc....Blah! There are all kinds of each one and no maker can be connected to just one. Jo has put many of the maker puzzle pieces together already. Jo's book does answer many of these questions and would get you caught up to speed if you're really interested in Party badges and enamels. Trying to identify some of the unknown markings is another challenge. There is some fun to be had in this area of study, isn't there?
And fine looking badges you have posted, Erno!!