That Colt cobra was made in 1976.
That sn doesn't fall in the Cobra range.
SN doesn't appear in sn tables
Made in 1951, second year of production.
1967
What is the age of a Colt Cobra with a serial number 58472-LW
I do not know the value but the serial # B74385 shows a manufactured date of 1971(B61701-B83550)
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.
Proofhouse.com has Colt sn data.
No serial number provided.
Proofhouse.com has Colt serial numbers you can look up.
colt cobra 38 special serial number 139350