Having researched the gun online, the model seems to be a reproduction of the 1873 CATTLEMAN, in .44 caliber.
The gun also has the silver rattlesnake grips ( aka Clint Eastwood’s gun when playing the man with no name in Fistful of Dollars etc), which is described as a Single Action 5 1/2” Artillery with colour case hardening and the infamous silver rattlesnake grips.
Barrel is stamped ‘Cal .44 Black Powder Only - A Uberti Italy’ and frame is stamped ‘Pat Sept 19.1871. & Pat July 2.1872’.
Please see photos.