The quality of the stamping does not appear consistent with either Prussian or Bavarian stamped badges of period manufacture.
The "rivet marks" on the back appear to be impressions, not actual rivets.
It does not appear to be a consistent, 3-piece badge that one would normally associate with this type of rivet assembly design (again, prior to this only seen on known, original Juncker badges). One piece for the bird, one piece for the backing plate and one piece for the badge itself.
based on either set of photos shown, that's what I see.