Model 1877 Colt Lightning and Thunderer
In 1873 Colt first produced the Single Action Army (SAA) revolver which has been called the Peacemaker and is commonly seen in Cowboy movies.
Most people think this was the only handgun used in the west.
Few people know Colt first produced a double action revolver in 1877 which became known as the Lightning (in 38 caliber) and the Thunderer in (41 caliber).
I happen to have one of each.
While the SAA developed a reputation for reliability and durability unfortunately the double action revolver developed the opposite reputation.
Few used it but among those few was John Wesley Hardin and Billy the Kid.
The first two photographs are Thunderer; that last two are Lightning.
The grips are known as bird's head grips.