Around 1971
Based on serial # B74385,it was produced in 1971.
1974
around 1951.
if serial number ends with letters 'LW' then made about 1961
probably made early '50's, but not sure....................
According to Proof House your gun was made in 1974.
You need to call Colt. That sn does not show up on the published data that is available.
What letter or letters does your Colt cobra have? From 1950 to 1977 the Colt cobra had letters either after or before the serial number.
your colt cobra was made in 1968.
What is the age of a Colt Cobra with a serial number 58472-LW
If the Colt cobra's serial # is 25400LW, it was produced in 1953.
Your colt cobra was made in 1966.