From a revolver that looks similar: "History: This is a Smith & Wesson Victory Model from World War II. It is U.S. Property marked and G.H.D (Guy H. Drewry) inspector marked from Springfield Armory. These were made from 1942 to 1944. There were a little over a half million made. They were standard issued side arms for US Navy and Marine air crews due to their size and ease of operation. It is .38 S&W rather than the .38 special that the U.S. military used."
Will need serial number to determine age & model. Also need caliber as marked.