I'm not sure if Colt even knows. You could call them and ask, but, don't expect an answer.
Colt sells them.
You will have to call Colt to find out.
50-500 usd
You will have to call Colt. Published serial numbers stop at 1978
No way to answer without a serial number.
Follow the instructions in the owner's manual. If you don't have one, call Colt and they will send you one.
Late 1980s or early 1990s
No published data for sn; 50-750 USD
@ 1973
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
Company proprietary information not in the public domain.
1968