Not Remington, not S&W, not Colt, etc. The firing pin is in the center of the recoil shield. A firing pin means either rimfire or center fire - not percussion cap & ball. I'm thinking center fire. There is a steel firing pin bushing. Since the firing pin is centered in the recoil shield, it is not a revolver - it's a single shot. There are also no mechanics to rotate a cylinder or to lock one in place. The barrel tips forward to extract and reload. The elongated slot on the right side unlocked the barrel for doing that. Not from an expensive pistol as the frame is brass which is now cracked just in front of the recoil shield. A brass frame could mean a low pressure chambering. A possibility it's some type of shot pistol frame, firing a small gauge/caliber shot round. It's a paperweight now.