Someone posted a link (many months ago) as to the set of chips now located in the Truman Library. I have lost that link and would really appreciate locating it once again. The set we have is identical to this one, with all the documentation needed to prove it's authenticity. The set in the Truman Library was the "back-up" set on Air Force One. We have the original set that was given to one of the stewards who served aboard Air Force One during the Truman Administration. It is now available for sale to anyone interested. Thank you all so much.