List of Winchester models
Firearms produced by the Winchester Repeating Arms Company (later Winchester-Western Company and U.S. Repeating Arms Company), 1866–2006, by model: Sequential Model Numbers (Rifles) 1919-39. "In 1919 Winchester abandoned numbering models by the year of introduction and assigned two-digit numbers, sequential beginning with 51 for rifles. Older guns still in production had their model numbers truncated, e.g. the Model 1912 shotgun became the Model 12. There was one exception: the unconventional "Thumb Trigger" rifle, which was not previously numbered, was given the designation 99."