around 1978
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.
Look on the frame
If it is Colt single action army, then it was made in 1889.
serial # 56649
1970
about 1907
1883
1886
If this is a Colt single action army, it was made in 1874.
A Colt single action army (Pre-War) with the serial # 305068 would have been produced around 1908.
about 1976