This Darne-system gun was made by Liège maker A. Forgeron using a Patent of Charles A. Levé:
At the first glance there is nothing unusual, but openeing the system also opens the eyes: there are two additional cartridges beneath the barrels, making the gun a four-shooter.
More information on this unusual action can be found in a 1977 edition of the American Rifleman, written by Roger Barlow:
