Take a look at www.proofhouse.com for colt and browning serial numbers. estimated mfg. date 1975.......................
That colt commander with serial # 39487LW was produced in 1959. (39450LW-41500LW) mfg date is 1960, not sure if '70 or '80
100-800 usd
According to proofhouse.com ,a Colt combat commander with that serial number was manufactured in 1977. The 1978 series started with 70SC57900.
No way to answer without the serial number.
You will have to call Colt with the serial number to find out.
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.
rc46661
The Colt commander with that serial number was made in 1955.
Go to proofhouse.com for Colt combat commander serial numbers.
Would need the serial number to answer.
You will have to call Colt