This Chinese production C96 Broomhandle pistol is found in the collection of the UK’s Royal Armouries. Curator Jonathan Ferguson showed it off recently in this video briefly.
It notably the word pistol engraved on the side where it should say Mauser. Just in case you couldn’t tell I suppose.
Idk about that. Granted, my answer on its own was almost interely useless, but it was nonetheless correct. Praise the OP 🙌