You must call Browning.
Your serial number indicates that your Glenfield model 20 bolt action was made in the year 1980.
With the serial number that you have provided,your Winchester model 88 lever action rifle was made in the year 1962.
Looking at Winchester models, there is nothing listed for a Model 90 with serial number 298032. They have Model 1890 in a slide action, Model 1900, 1902, and 1904 in a bolt action rifle.
With the serial number that you supplied,your Winchester model 1912,pump action shotgun was made in 1961.
With the serial number that you provided.Your Winchester model 88 lever action rifle was made in 1960.
With the serial number that you have supplied,your Winchester model 12 pump action shotgun was made in the year 1941.
Impossible to answer without the model, type of action and serial number.
With the serial number that you have provided,your Winchester model 70 bolt action rifle was made in the year 1989.
With the serial number that you supplied,your Winchester model 1912 pump action shotgun was made in the year 1916.
With the serial number that you supplied,your Winchester model 1912,pump action shotgun was made in the year 1959.
With the serial number that you supplied,your Winchester model 70 bolt action rifle was made in the year 1971.
With the serial number that you have provided,your Winchester model 1897 pump action shotgun was made in the year 1902.