Alicia -- I am not attacking you or your credibility at all. The authors of these price guides print they know for a fact. At the time of publication, James may have thought that the $500 Landmark chip was unique...it may still be. As you suggested below, James may have edited the picture you sent to him to enhance the look...only James knows that for sure. Your chip is fantastic and even if there happened to be two of them, it is still an extremely valuable chip.
Might I suggest that you talk with James to get his side or have him post his response here to clarify this matter, if you desire. Once again...the best of luck with your auction. Steve B
Picture of $500 Landmark chip from James' book