small unknown pistol
First time user and hoping for some help? I am trying to figure out what this very small pistol is. The barrel is approx 3" long and overall about 5". The markings where the handle was I see - A2 and 18. On the underside near the trigger it the letter U and looks have to Crowns stamped. I have tried to get a close up as I could on it so you can see the markings?
Help would be great and if there is some value to it?