it's a nice Julius Kremp Lüdenscheid .
Can you give us indicators Markus as to why Julius Kremp?
Cheers Markus, all good for learning
Excellet, Markus! Thank you for the identification and for showing the tabbed example! These aluminum Luftwaffe buckles are very similar looking to me. It looks like the blank areas above and to the left of the eagle on the backside might also be indicators of Kremp, as your example and mine both have it.