These are very interesting handguns. The 7.62 X 25 Ctg. copied from the .30 Mauser 7.63 X 25 which was chambered in the famous C 96 Broom Handles.
These pistols were copied from the Browning pistols. They do have a unique modular sear system easily removed and replaced. Back years ago when they were plentiful and very cheap I owned a number of them.
I converted them to different Ctgs. 9MMs and 38 Supers. I placed one in a muddy creek during snow run off. It was filled with sand and mud. I removed the gun from the creek poured the water from the barrel. I proceeded to run two magazines thru it without a FTF.