This is a Rigarmi Brescia made in Italy. It appears to be a .25 caliber. It is quite heavy for its size and has no sights. I have just one mag, which looks to have about 8-10 rounds of capacity. I’ve never shot it. In fact, I have no idea how long I’ve had it or how old it is.
Other than this, I know nothing more. If you have some information, please comment. Also pictured above is the front and back of the certificate that came with the gun.
Thanks for looking, ODT!