Before Samuel Colt popularized the mechanical connection between the revolver hammer and cylinder, the revolvers being made were manually operated. This example is a copy of a third type Collier (that is to say, a gun made originally for percussion caps). After firing, one pulls the cylinder back against a spring and rotates to the next chamber. A shield at the front of the cylinder protects the chambers, and the cylinder mouth is chamfered to seal into the barrel, preventing most of the gas leakage at the cylinder gap. This beautiful ornate example was made by Salvatore Mazza of Naples (the official armorer of the Prince of Sicily, he would like you to know!), most likely in the 1820s.