1) Plumb & Collins M-1917 Bolo Knife with Rock Island Arsenal sheath dated "1917" sheath. Fine with spotting and some pitting, and grinding marks along the edge. 4) Fayette R. Plumb M-1917 Bolo Knife with Brauer Brothers canvas and leather sheath dated "1918". Fine. 3) Plumb St. Louis Model 1917 Bolo Knife with stamped steel sheath. Fine. 4) Springfield Armory M-1910 Bolo Knife with canvas and leather Brauer Brothers sheath dated "1918". Fine.