A RARE COLT 1851 MODEL U.S. GOVERNMENT ISSUE PERCUSSION REVOLVER, No. 59711 for 1856, the blued barrel with New-York address, blued cylinder, frame and trigger-guard, and case-hardened grip-strap stamped 'USN' on the butt, walnut grips, one stamped 'GMR', matching numbers (except wedge), and nearly all its original finish, the hammer in the white