Smith & Wesson 2nd Model "Hand Ejector" RevolverAll further official-issue pistols purchased for Canadian WWI service were this model of revolver (also referred to as the "New Century" model) chambered for the British .455 service cartridge. [Note: in the beginning, Smith & Wesson actually supplied, and Canada accepted, a number of "First Model" (or "Triple Lock") Hand Ejector revolvers.] A total of 14,500 S&W Hand Ejectors were acquired in 1915 and 1916, which makes this model Canada's primary Great War handgun. It was also designated a "substitute standard" sidearm by the British War Department, which acquired thousands of them to supplement inadequate supplies of the official Webley revolver (discussed below). (The example of S&W Hand ejector shown, though it has no Canadian acceptance or ownership stamps or proofmarks, is documented as having been shipped by Smith & Wesson on December 24, 1915, to "Canadian Government, Ottawa, Canada". The lack of official markings would suggest that it was purchased from the government by an Officer.)
Configuration of Canadian-issue arms: Double-action revolver; blued finish; walnut grips; 6.5" barrel; chambered for .455 British service cartridge; 6-round capacity; cylinder swings out to left side for loading and extraction. In service 1915-1951.
http://www.canadiansoldiers.com/weapons/pistols.htm