When it was introduced, it was called .30 WCF (Thirty caliber Winchester Center Fire). At some point became 30-30. Value depends on condition. Around $ 300 would be somewhere in the ballpark. Marlin originally used 30-30 so they wouldn't have to put a Winchester "brand" on their rifles when manufactured in the caliber.
Your winchester model 770 was made by winchester between 1969-1971.
Winchester did not make a model 81.
your Winchester model 1894 was made in 1928.
Your Winchester model 1894 was produced by Winchester in 1912.
your Winchester model 70 was made in 1991.
Your Winchester model 1894 was made in 1954.
Your Winchester model 1873,was made by Winchester in 1891.
Your winchester model 1894 was made by winchester in 1972.
Your winchester model 1894 rifle was made by winchester in 1910.
Your winchester model 1894 was made by winchester in 1972.
Your winchester model 1894 rifle was made by winchester in 1952.
Your winchester model 63 was made by winchester in 1947,