Re: small unknown pistol
You have a German "parlor-pistol". It fired an extremely low-powered rimfire round (probably a 6mm Flobert) and was designed for indoor target practice - either in the living room (the parlor) or down at the bar (instead of throwing darts).
They were made by the gazillions, all over Europe, and in perfect shape might be worth a hundred bucks.
Yours - maybe 50.
Meddle not in the affairs of dragons, for thou art crunchy, and taste good with catsup - George of Lod, Year of Our Lord 297
I always take precautions.
Beware the Evil Bullet Fairies.