my aunt gave me a 20 for buying coins and i noticed that there was a serial number on the back but it was faded. she wouldnt let me keep it because we already drove an hour to the coin shop and i had to spend it on some error coins. are the worth anything, please tell me there not haha.
Was the printing in reverse? If not, it was probably worth $200-$500. http://www.cointalk.com/t173330/
Just a bleed-through then, don't think those hold too much extra value, but I've been wrong before...