U.S. REGULATION M1861 NAVAL CUTLASS AMES MFG MARKED U.S.N. D.R. 1864 national park service photo
The 1861 Ames was 32-inches long with a 26-inch blade, and was in service from 1860 through 1949! This example, marked U.S.N. D.R. 1864, is in the National Park Service collection.