The Winchester Model 12 was never sold under the JC Higgins name.
Winchester
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.
JC Higgins Model 20 Shotgun does not have a serial number. Guns were not required to have a serial number before 1938
Your Winchester model 1894 rifle was made by winchester in 1971,with the serial number you provided.
your Winchester model 1894 was made by Winchester in 1928.
Your Winchester model 1894 was made by Winchester in 1940.
Your winchester model 70 was made by winchester in 1965.
your winchester model 1894 was made by winchester in 1979.
your Winchester model 62A serial no.349772 was made in 1956.
your Winchester model 190 was made from 1974-1980.