I just found a L C Smith double barrel shotgun, and have no idea what it is. It has 30" barrels, is a muzzel loader with 'rabbit ears'. On the under side of the barrels it has stamped 28, is that the *****? Also stamped are the numbers 652, serial #? And L C 4. Does this mean grade 4? There are no external markings at all on the gun. It has engraving throughout the entire gun, and what looks like a walnut stock with checkering. I was wondering about attempting to clean the surface rust and other blemishes. Any info would be great. You could e-mail me at [email protected].