my guess would be late 1970's
Your light weight commander was produced in 1978.
Production date was 1968.
1968
Sometime after 1951 .
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.
You need to call Colt. That sn does not appear in any published data I have access to. I believe about 1975
1966