about 1875
1970
1959
After 1978.
1958
it ain't worth a monkeys left ball
Based on proofhouse.com, it was made between 1958 & 1959,
about 1976
1974 Source: mine :) my precious darling I'm a gun specialist
Around 1885.
A Colt single action 1860 army with that serial number was made in 1866.
Your colt single action army dates to 1881 with the serial number you provided.
Go to www.proofhouse.com my reference book says 1876