No serial number given.
Made from 1959-1976
About 51 years old. Made about 1959.
1974
About 1969.
61 years old.
53 years old
50-400 uSD
Colt
Your colt trooper was made by colt at the end of 1968.
Your colt huntsman was made by colt in 1967.
Yes, Colt and others made them for Colt
Made by Colt.