The U.S. Navy purchased 4,300 of Whitney Navy revolvers during the Civil War, with roughly 33,000 of 1st and 2nd Model Navy revolvers manufactured by Whitney in the late 1850s to early 1860s in various configurations. This 4th Type falls in the serial range of 15000-25000. Matching serial number on the bottom of the barrel, the cylinder pin, rear of the cylinder, and back of the grips. "E. WHITNEY/N. HAVEN" marking on the top of the barrel at the breech. Roll stamped cylinder scene of an eagle, lion, naval engagement, and shield bearing rib with "WHITNEYVILLE". "FCW" inspector mark on the left side of the frame. Boxed script "FCW" cartouche on the left side grip panel. This revolver is identified as one of approximately 900 revolvers delivered to the Navy between February-May of 1863 and subsequently marked with the initials of Washington Navy arms inspector Frank C Warner.