1977 for commercial production
That Colt python was produced in 1981.
YOu need to call Colt
Your colt huntsman was produced in 1973.
Your Colt Lawman revolver was made in the year 1972.
Published data does not cover the 1991. You will have to call Colt.
your colt trooper was produced in 1968.
Your colt python was made in 1975.
According to profhouse.com, it was produced in 1977
Based on the serial # 74000, that Colt police positive .32 was the first one produced in 1910. about 1914
It was produced in 1971,
Colt gold cup national match .45 with that serial number was produced in the first year of production, 1957.
Colt data at Proofhouse.com