This Autographed On Personal Letterhead Dated August 9, 1926 5.5x8.25 Letter with the inscription of "I saw 2 Lincoln letters in Gordon Bennet father's sale." has been Personally Signed by Harry Houdini. This item is 100% Authentic, it comes slabbed and authenticated by Beckett Authentication Services. The authenticity can be verified on Beckett Authentication Services website.