This revolver is listed by its serial number in the "Standard Catalog of Smith & Wesson" by Jim Supica & Richard Nahas as a Model 3 that was purchased by the U.S. government (page 91). Compounding the significance of this revolver is the rarely observed oil hole (located on the rear of the extractor housing on the bottom of the barrel lug) as found on the first 1,500 or so of this model. The barrel rib has the one-line S&W address/patent dates marking (no visible "U.S." mark on the top strap as is generally found on the barrel rib of these martial revolvers, although several are known that failed to receive the U.S.). The frame has U.S. sub-inspector's marks "A" on the left side and the "P" proof on the right frame next to the recoil shield. Matching assembly marks are found on the grip frame, cylinder, barrel and barrel latch. The right grip panel is numbered to the gun. There are no cartouches. Matching assembly marks are on the grip frame, cylinder, barrel and barrel latch. The S&W American Model was the first cartridge revolver adopted by the U.S. military and saw use throughout the Indian Wars as it was reported to have been issued to the 2nd, 3rd, 4th, 5th, 6th, and 7th Cavalry. Surviving examples of U.S. martial Model 3 Americans, especially early production oil hole examples, are scarce and highly desirable in any condition.