Winchester Firearms Manufacturing Dates by Serial Number and Year. 1866 through the early 1990s. Below is the download link for a special resource for .Firearms produced by the Winchester Repeating Arms Company 1866-2006, by model: Contents. [hide]. 1 Year-model numbers 1866-1912; 2 Sequential .The Model 70 was introduced in 1936 and is currently in production. Calibers range from the .22 Hornet to the powerful .458 Winchester Magnum. The pre-64 .06/01/2017. By Joel Kolander. Winchester Model 1866 rifles need no introduction - they WERE the introduction. An American legend was born with them that .