Is the caliber .38 S&W or .38 Special? Is there a V stamped on the butt?
If the serial number is V83166 then last half of 1942. .38 S&W would be a lend-lease British Service Revolver, .38 Special would be a Victory Model. U.S. Property would have been stamped on the top strap for either variant, this may have been scrubbed for resale.
If 83166x then 1941. This would be a commercial contract K200 British Service Revolver if .38 S&W or a .38 Military & Police Model of 1905 4th Change if .38 Special.
If simply 83166 and .38 Special, then its a Model of 1905 1st or 2nd Change from 1906. Desperate times after Dunkirk led to acceptance of any weapon they could find, including .38 Super 1911s, 45 ACP Model 1917s and 1911s, etc.