The Winchester model 20 was a youth .410 single shot gun manufactured between 1918-1924. Only about 24,000 were built. Your serial number is not from a Winchester model 20.
Your Winchester model 1894 rifle was made by winchester in 1971,with the serial number you provided.
Your Winchester model 74 was made by Winchester in the year 1949,with the serial number that you provided.
With the serial number that you supplied,your Winchester model 70 rifle was produced by Winchester in the year 1973.
With the serial number that you supplied,your Winchester model 1894 rifle was produced by Winchester in the year 1940.
With the serial number that you supplied,your Winchester model 70 rifle was produced by Winchester in the year 1984.
With the serial number that you have supplied,your Winchester model 12 shotgun was made in the year 1916.Your serial number indicates that it was made by Winchester in 1916.
If you are asking when it was produced?Then your Winchester model 61 was made by Winchester in 1953,with the serial number that you provided.
With the serial number that you provided,your winchester model 12 shotgun was made by winchester in 1927.
With the serial number that you provided,your winchester model 1894 rifle was made by winchester in 1913.
With the serial number provided,your Winchester model 62a was made in the year 1957.
With the serial number that you provided,your Winchester model 62A was made in the year 1953.
With the serial number that you supplied,your Winchester model 61 was made in the year 1941.