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about 1976
Around 1885.
about 1875
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.
If it is Colt single action army, then it was made in 1889.
eBay
If this is a Colt single action army, it was made in 1874.
probably made early 1980's
Look on the frame
My records indicate that your 45 colt single action army was made in 1883.
1970