could you give the serial number? it is without a proof, right? so made before 1891...

I ask for the chamber because the 22 lr was not realy popular in this times and when I look into the Dreyse ammo catalog undated but after 1904 there is the 22 short and 22 long but no 22 lr.

seems unlikely they chamber a cartridge but dont have it in production 15 years later. and you know how easy it is the rechamber 6mm flobert, 22 short and long into 22 lr.