1970
The question can't be answered without a serial number. You can call Colt with the serial number and they will tell you.
It tells the year of manufacture of a Colt.
You will have to call Colt
you will have to call Colt to find out.
@ 1908
Colt data at Proofhouse.com
Your colt was made in 1956.
made by Colt in 1913
No such model in the Colt line.
Call Colt with the sn and they will tell you.
it was made by Colt in 1917
@ 1908