about 1891
1889
1894
2001
1885
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Colt lightning .22 rifle with that serial number was produced in 1903
No way to answer without the caliber.
1902 for the .22rf lightning rifle and 1893 for .32,.38 & .44 cal lightning rifle.
An 1877 Colt lightning double action revolver with that serial number would be 110 years old, made in 1902.
The Colt 1877 lightning with that serial number was manufactured in 1888,about 121 years ago.
1884-1887 depending on exact model
1970