British Enfield 38cal No2 Mk1* or a No2 Mk1** variation (should be so stamped on the right side plate).
Made/proofed in 1943 so it could be the Mk1** version which came out in '42. again check the side plate for the marking.
Mk1** was a Double action only simpler made version of the slightly earlier No2Mk1*,,which was also DA only but a conversion of the SA/DA No2Mk1 original version.
Cal 38S&W in American speak.
RSAF Enfield made most of these. But some were made and marked Albion (Motor Co), those were made in Scotland during 2nd War.
A very few were made in Australia (less than 400 or500), marked HAV (Howard Auto Cultivator Co (?sp) .
Very rare to find one of these,,if it is an HAV,,it is a highly sought after pistol!.
Even an Albion marked No2Mk1* is kind of hard to find and any of these are zooming ever upwards in prices of late.
The revolver was a standard issue sidearm of the British and Commonwealth Soldiers in WW2. It remained a secondary issue and in use in many parts of the world into the 70's, probably later in the off the beaten path parts of planet.