Don, it looks like your model 12 was produced in 1941, according to the tables linked below. Besides trench and riot guns, model 12s were procured for use in air gunnery training. These guns had the full-length barrels seen on your Model 12. Good looking gun! McHenry Sportsmen's Club - Winchester Model 12 Serial Numbers (mchenry-sc.org) Like most of the Winchester production date/serial number tables floating around today, this one is badly flawed. When WWII Model 12 production ceased in 1944, serial numbers were into the 1,036,000 range. The table shows that those guns were made in 1947. It is just as bad with the WWI Model 1897 trench gun serial numbers. Most of the tables show the WWI guns being manufactured in 1920-1922.