I have a 357 magnum AV88539 How do find out how Old.

Only what one is willing to pay.
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trying to find the value of 357 python chrome 6in barel

From the Colt website (using j88988 as the serial number)
http://www.colt.com/CustomerServices/SerialNumberLookup.aspx
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1972
"MKIII SERIES: LAWMAN, METROPOLITAN,OFFICIAL POLICE, OFFICER MODEL MATCH & TROOPER" This is an approximate date. For a complete firearm history contact Colt's Archive Department.

.30 cal is the more powerful round
.30 1990 fps 975 ftlbs
.357 1500 fps 550 ftlbs

Look inside the crane.

The gun you our asking about should be around $1200.00. The smith and Wesson does not make that gun any more they where the first one to manufacture them. The serial number is pretty low 66 gun maid in the first run of the 357. So your number is in the right area for a good price in fact any Smith an Wesson 357 our worth a lot so good luck if your going to sell it. If you list it on gun for sale . com you will be bared with offers right now the prices our soring.

Colt Pythons were made from 1955 through 1999 although the Colt Custom Shop did make some through 2005.

357 magnum is just the caliber. In order to know where the serial number is, you would need to tell the manufacturer and the model as well.

Go to cbtricks.com look up radio information go to magnum use the wiring set up for the 357.