I have what I have always thought was an Iver Johnson top-break Safety Automatic Double-Action revolver; however, it does not have any manufacturer's name on the gun. Additionally, there are absolutely no markings, other than what appears to be a serial number (20473) on the bottom of the trigger guard. It is a bouble top post latch, heavy nickel finish, and it has two cross pins in the lower frame. Actually, it appears in every respect to be like the photo Iver Johnson photograph on page 607 of the 2009 Standard Catalog of Firearms. It does not have the original grips and it has a small hole in the butt of the handle (perhaps for a lanyard?). The barrel measures exactly 1.75 inches from the tip to the cylinder. Please provide any information about identification. Thank You.