That might be the same brand the father of a High School friend had. A German brand. He was German, served on the Russian Front during WW2.

His semi auto was a 22 RF when using sub sonics wouldn't blow back the bolt enough to lock it in place. But did extract and eject the used case. The bolt would move forward, load the next cartridge from the magazine, fire it and so on. Till the whole magazine was fired.

He used to shoot feral pigs with it.

By the time I met him, he was anti hunting.

John Howard stole it off him and probably crushed it.