http://jamesdjulia.com/item/2203-391/

The Sisterdale revolver is one of the most original designs of the Confederate revolvers. It was devised by a group of Texans led by one Alfred Kapp, son of a German immigrant in Sisterdale, Texas. He and his compatriots made six of these revolvers on the Kapp homestead with the intention of obtaining a contract to make them for the Texas government and for their own armament during the Civil War.

The plan came to naught, most likely because the revolver's design left much to be desired. In particular, it features a long flat spring as a cylinder stop on the top strap, and an external hand to rotate the cylinder. Of the six apparently manufactured, only this example is known to exist today, having been passed down for decades by the Kapp family.

http://www.patreon.com/ForgottenWeapons