The http://www.answers.com/topic/winchester-repeating-arms-company Model 1912 (also commonly known as the Model 12, or M12) is a hammerless slide-action, i.e., http://www.answers.com/topic/pump-action, http://www.answers.com/topic/shotgun with an external tube magazine. Popularly-named the Perfect Repeater at its introduction, it largely set the standard for pump action shotguns over its 51 year high-rate production life. From 1912 until first discontinued by Winchester in 1963, nearly two million Model 12 shotguns were produced in various grades and barrel lengths. Initially chambered for 20 gauge, only, the 12 and 16 gauge versions came out in 1914, and the 28 gauge version came out in 1934. A .410 version was never produced; instead, a scaled-down version of the Model 12 known as the Model 42, directly derived from scaled drawings of the Model 12, was produced instead. The Model 12 was made in 1912 and came out to the public in 1914.
Your model 12 Winchester shotgun was made by Winchester in 1926.
Your serial number indicates that your Winchester model 12 16 gauge shotgun was made in the year 1925.
Your winchester model 12 shotgun was made by winchester in 1953.
Your winchester model 12 shotgun was made by winchester in 1937.
your Winchester model 12 shotgun was made in 1929.
Your Winchester model 12 shotgun was made in 1929.
With the serial number that you supplied,your Winchester model 24 was made in the year 1947.
Your serial number indicates that your Winchester model 1912 pump action 16 gauge shotgun was made in the year 1913.
your model 12 Winchester shotgun was made in 1947.
your Winchester model 12 shotgun was made in 1954.
your model 12 Winchester shotgun was made in 1956.
Your winchester model 12 shotgun was made in 1931.