The serial number you give is too low to be a Colt detective special. Colt detective specials were produced in 1927 starting with serial number 331000.They were cut-down versions of the Colt police...
It's from 1969.
It would be 78 years old, having been made in 1933.
about 1933
It was made post 1978. You will have to call Colt to find out more.