Need Help on unknown model

Firearm has on chamber a crown ans says Erfurt.


In front of it (looking down on gun) it has a n with a small crown looking object.


Underneath the barrel, in front of the trigger gaurd there is a number 50465.


There is a 65 where the hammer would be located.


On the left side of the firearm, just above the disassembly lever, there is two markings just like the N with the crown looking thing.


Under the safety, it says Gesichert.


I believe it is a 9mm.


There are absolutely no other markings


Any help would be appreciated.