you must provide the serial number in order to determine the mfg. date.................... on any firearm.
You must call Colt to find out.
About 1961.
1991
Colt gold cup national match .45 with that serial number was produced in the first year of production, 1957.
Your Colt gold cup national match .45 was made in 1969.
You will have to call Colt to find out.
Made in 1960.
1975
made about 1963.......
The Colt 45ACP National Match with serial number 17235-NM was manufactured in 1969.
Colt gold cup national match .45 with that serial number was produced in 1961.
Your Colt gold cup national match .45 was made in 1966 per proofhouse.com. The production for that year started off with serial number 16600-NM.