First up has no markings;
https://www.milsurps.com/images/impo.../LRQJMPD-1.jpg
https://www.milsurps.com/images/impo.../CsO4MHy-1.jpg
https://www.milsurps.com/images/impo.../e1LWfHi-1.jpg
https://www.milsurps.com/images/impo.../wIEgN0k-1.jpg
https://www.milsurps.com/images/impo.../DYO6dz3-1.jpg
Second, this one is marked Adahl Barmen 1917;
https://www.milsurps.com/images/impo.../qopXKUq-1.jpg
https://www.milsurps.com/images/impo.../yPSWKLe-1.jpg
https://www.milsurps.com/images/impo.../MZYqsHa-1.jpg
Third came with a 1932 Walther PP and fits it perfectly, no marker name;
https://www.milsurps.com/images/impo.../1vFghR2-1.jpg
https://www.milsurps.com/images/impo.../s0mPKYX-1.jpg
https://www.milsurps.com/images/impo.../90Ffngr-1.jpg