Apart from the Fake Adler Markings, they are NOT German: They are Portuguese M937 Breda strip carrying cases; IMA Bought and destroyed hundreds of Portuguese Bredas (made by Soc. E. Breda, Roma, for the Salazar Portuguese Gov't in 1937-39), in cal. 7,9mm ( Clips are different from Italian 8x59RB Breda ammo); They even sold complete Spare Parts Cases (Armourer's Kits, with Parts, Charts Tools etc) and "Re-welded" Up "Dummy Guns", destroying most of the ID stampings (Port. Crest etc) in the Process. Misrepresentation and Deceptive advertising typical of IMA.
Germany did "acquire"( confiscate) Breda Guns in Italy (43-45) but they were in 8x59RB, not 7,9mm. Whilst Breda did offer the M37 Gun in 7,9mm to other buyers besides Portugal and later, Spain, it did not have very wide distribution outside of Italy Before or during WWII; ( Obsolete strip tray feed); after WW II, the Breda Gun was maintained in Italian service until replaced by the MG42/59 in 1959-60.( alongside the British Bren Gun, and the US BAR and M1919A4).
Spain did make a Belt-Fed version in 1942-43, but it saw little use.
Any connection "Breda-Germany" by IMA is BS, if relating to 7,9mm cal.
Doc AV