That's like asking how much is a car worth. Not enough information to give you a realistic range. Could be worth 150 or 1000 or anything in beteween. Need to know all markings, serial number, overall condition, grips, grip material, barrel length, any engraving, got the box, owner's manual, etc..
10-1000 USD depending on specifics
50-250 usd
50 -550 usd
50-250 USd
100-400 USD
0-800 usd
50-500 usd
50-500 usd
-40 - 400 usd
50-375 usd
38 special
Maybe. You need to figure out which .38 your Colt is chambered in. .38 Short Colt and .38 Long Colt guns will not chamber a .38 Special. .38 Colt Special is the same as regular .38 Special. If you cannot tell which caliber it is you need to take it to a gunsmith and have him tell you.