The knife is part of a special firearms exhibit from the Smithsonian called "Journeying West" and it will be at the Buffalo Bill Center of the West in Cody, Wyoming, for the next couple of years. Besides the revolver/knife, the exhibit includes a rifle made for Catherine the Great of Russia and a wooden model of the Gatling gun that was submitted as a patent model.
Photo by: John S. Holler German multi-bladed folding knife with 100 "blades," including a .22 caliber pistol, ca. 1880. Smithsonian Institution, National Museum of American History, Kenneth E. Behring Center. L.373.2012.5_