A very scarce American Civil War Revolver Holster.
It would appear to be for an 1851 Colt Navy percussion revolver.
Measuring 15 inches in length.
Oval makers stamp to the front flap for "J.E. Condict, New York" with partial address visible.
This example is "as found" and currently in fragile condition, with some loss toward the muzzle. Although all holding firm, and generally sound, retaining its full and functioning flap, fastener, and belt loop, it would benefit from some feeding and conservation work to preserve it for future generations.
A true rarity, and a seldom seen opportunity to add a period original holster to your display.