Jon has told you about the serial number.
Don't get Fender Fenders confused with Squier Fenders either.
Once you know the serial number you should be able to find out the year here
http://www.guitardaterproject.org/fender.aspx
Then you could try Googling:
"reverb.com Fender Jazz Bass (year)"
and you will see a range of used prices.
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