Manufactured in 1975.
If that is the colt combat commander, it was manufactured in 1962.
Manufactured in 1978.
Made in 1976.
made ABOUT '77/'78
You will have to call Colt to find out.
Made in 1973.
made about 1978 or 1979
1970
If not listed at Proofhouse.com, call Colt
about 1978
I would guess about 1980....................