text: The Enola Gay is at the Smithsonian Institute.  It is the most photographed airplane ever.  Do some YAHOO! searches to discover the value of your "hidden camera" photos.  Be prepared to document proof that your grandfather served at the base where the photos were taken (DD214 duty assignments, pay slips, etc.).  Sworn testimonials, documentations and so forth.  You cannot determine the value of anything without doing research, then the value is determined by what someone is willing to pay and what someone is willing to accept.  Another source of internet research is AUCTION HOUSES.  Otherwise, anyone who blindly gives you an "educated guess" as a quick answer for 2 points needs educating himself.  Good research is your answer.