The records I have only go up to 1978 with the suffix SA after that they used the prefix SA, so I would guess around 1979 or in the early1980's.
your colt single action was made in 1970.
If it is Colt single action army, then it was made in 1889.
your colt single action scout was made in 1964.
If this is a Colt single action army, it was made in 1874.
After 1979.
your colt single action army was made in 1902.
My records indicate that your 45 colt single action army was made in 1883.
A Colt single action 1860 army with that serial number was made in 1866.
Your colt single action army was made in 1906.
Made in 1973.
Colt single action army with that serial number was made in 1910
Colt data at Proofhouse.com