No way to answer without a serial number.
50-500 usd
You will have to call Colt to find out.
Try proofhouse.com, if sn not listed, you will have to call Colt
You will have to call Colt. Published serial numbers stop at 1978
Only Colt knows. Most likely they won't reveal the number.
@ 1973
Late 1980s or early 1990s
1968
1966
1953
Anywhere from $1100 in 100% condition to $450 http://www.usedprice.com/dropdown.php?catname=gun&mfrid=&typeid=&itemid=&query=Series+70+Lightweight+Commander&x=33&y=17
The records I have show a Colt combat commander with serial number CLW0015879 as being produced in 1972.