Archaeological discoveries

I have a 1935e circulated silver certificate with double die error on the back what value does it have?

It's unlikely that you have a 1935E circulated silver certificate with a double die error on the back. The 1935E silver certificate is a rare and valuable note regardless of any printing errors. Due to its significance, it is unlikely to have escaped discovery and attention from numismatists, making a double die error even less likely. If you do have a note like this, it would be worth consulting with an expert or authenticating service to determine its value accurately.