[surbat6]

That "ELG" in the oval cartouche is a Belgian proof mark. Do you know the caliber of that little bulldog-style revolver?
The ejector style on that piece is fairly common among European revolvers. You usually unscrew the center rod projecting from the cylinder pin about a quarter turn to unlock it, then withdraw it toward the muzzle and pivot it to the right (the right side as you hold the pistol normally). Then it acts just like the ejector on a single action Colt, pushing the empties out individually.