This is a Mutterkreuz bronze Halbminiature CLIP / Motherscross Halfsize Clasp.
Extremely rare half size mohterscross (from top to bottom measuring approximately 31 mm).
Only a handfull of these clipback crosses are known in the collectorsworld!!!! Most collectors dont even know that these exist.
These were intended for wear on the breastpocket of a woman’s dress.
From my own collection.