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Gauge
Serial Number Range Year of Manufacture
50,000 - 50,499 1959
50,500 - 51,999 1960
52,000 - 52,499 1961
52,500 - 55,999 1962
56,000 - 63,499 1963
63,500 - 75,499 1964
75,500 - 91,499 1965
91,500 - 102,999 1966
103,000 - 110,499 1967
110,500 - 117,999 1968
118,000 - 129,499 1969
129,500 - 140,499 1970
140,500 and Up 1971
The Winchester Model 101 12 gauge was manufactured after 1971, but no serialization records currently exist.
20 Gauge, 28 Gauge, & .410 Bore
Serial Number Range Year of Manufacture
200,000 - 208,999 1966
209,000 - 210,999 1967
211,000 - 214,999 1968
215.000 - 220,499 1969
220,500 - 228,499 1970
228,500 and Up 1971
The Winchester Model 101 20, 28 gauge and the .410 bore were manufactured after 1971, but no serialization records currently exist. Note: The 28 gauge and .410 bore were first introduced in 1968.
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