Sometime after 1951 .
You will have to call Colt to find out.
Production date was 1968.
1968
Made in 1970
1968
If it is CLW0037116,it was after1978
Produced in 1967 (Production run 49651LW to 53400LW )
between 1952 and 1953
The records I have show a Colt combat commander with serial number CLW0015879 as being produced in 1972.
my guess would be late 1970's
Your light weight commander was produced in 1978.
You need to call Colt. That sn does not appear in any published data I have access to. I believe about 1975