Canada's Colt Model 1878 Double-action military revolvers
One of the 1,001 Colt Model 1878 Double-action military issue revolvers purchased hastily by the Department of Militia & Defence in Canada through the New York outfitting firm of Hartley & Graham in 1885 when the North-West Rebellion of the Métis people of the District of Saskatchewan suddenly broke out. The revolvers "were nickle-plated. with 7.5" barrels, and chambered in .45 Colt." (Victorian Wars Forum)
Reading Canadian domestic military history can make for particularly New World experience, what with names like the Battle of Duck Lake and Fort Whoop-Up!