What do you want to know?
There is no such thing as a 70 series commander. It applies to the collet bushing that was made in the 70s. Your commander was mfg. sometime in the 70s without the that type of bushing.
That colt commander with serial # 39487LW was produced in 1959. (39450LW-41500LW) mfg date is 1960, not sure if '70 or '80
About $700-$850, depending on exact version and condition.
500 to 700 dollars depending where part of the US you live in.
value depends on overall condition.............
0-1400 USD depening on condition, box, papers, accessories, etc..
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
You will need to call Colt
the original colt gold cup 70 series is worth about 1,000 dollars roughly
You will have to call Colt to find out.
Depending on a detaliled description, it could be from 500-1000
The Colt Series 70 Gold Cup with the serial number 70N148xx was produced in 1974. The Colt Gold Cup models were known for their accuracy and features tailored for competitive shooting, and the Series 70 designation indicates specific design changes made by Colt during that era.