I have come across a 1953 5 dollar bill. I have never seen one before. It is actually a silver certificate with a blue seal and blue print for the serial number. I don't have a lot of knowledge about these. Basically, I am wondering if it is worth more than the obvious 5 dollars? It has very little creases in it. The only real marks other than the print is the "validity marker" we used on it at work trying to determine whether it was fake. Bank said it was real. Any help?