This is a Mutterkreuz (Motherscross) miniature, it is on the reverse maker marked L/13 (RARE!)
L/13 stands for maker Paul Meybauer from Berlin.
Among miniature Motherscrosses this is a very hard to find miniature. It’s appearance is by far NOT the best looking, it is actually crude made, most (if not all) miniature L/13 motherscrosses have a crude appearance on the front and are on the reverse always crude engraved and/or unclear stamped. The L/13 makers mark here too is not very sharp, this is a distinctive feature of this maker.
If you collect maker marked miniature Motherscrosses this is probably what you seek, if you only want a good looking Motherscross miniature it’s probably wise to go for another here on our site. This is however a rare mini!