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 proprietary cartridge (although efforts were made, unsuccessfully, to make a .45 ACP version for the US 1907 pistol trials).
Cool Forgotten Weapons merch! http://shop.bbtv.com/collections/forgotten-weapons
If you enjoy Forgotten Weapons, check out its sister channel, InRangeTV! http://www.youtube.com/InRangeTVShow
At Forgotten Weapons I think the most interesting guns out there are the most obscure ones. I try to search out experimental and prototype weapons and show you how they work, in addition to more conventional guns that you may not have heard of before. You’re much more likely to find a video on the Cei Rigotti or Webley-Fosbery here than an AR or Glock. So, do you want to learn about something new today? Then stick around!