The 45 Ross was made by U.M.C. circa 1903, It is estimated that probably only 50 rounds made for Sir Charles Ross (Ross Rifle Co.) of Canada for his pistol design

   

This is a very rare Ross automatic pistol, patented in 1903 by Charles Ross, of the Ross Rifle Company in Quebec. It is a short recoil, toggle locked design, made for the .45 Ross