Smith & Wesson "Military & Police" Revolver
In 1932, the British Army adopted a lighter top-break revolver - the Enfield No.2 Mk I - chambered for the new .380/200 service cartridge (a military loading of the .38 Smith & Wesson employing a somewhat heavier 200 grain bullet). During the 1930's, the fledgling RCAF obtained 585 of these British pistols, but with the outbreak of WWII, Canada elected to adopt the Smith & Wesson "Military & Police" model revolver (in effect, a lighter version of the "Hand Ejector") which, in .38S&W chambering, would accommodate the standard .380/200 British service cartridge. Over 118,000 of these revolvers were purchased from 1939 through 1943.
Configuration of Canadian-issue arms: Double-action revolver, ranged from early acquisitions with commercial polished blue finish and checkered walnut grips (such as the example shown here) through brushed blue to later "wartime finishes" of sandblast blue and sandblast parkerizing with smooth wood grips; 4", 5" and 6" barrels (5" most common); .38 caliber; 6-round capacity; cylinder swings out to the left for loading and extraction. In service, 1939-1964.
http://www.canadiansoldiers.com/weapons/pistols.htm