This Autographed The Cat in the Hat Hardcover w/ Slipcase Book with the inscription of "Best Wishes to Cathy and may your cat-in-the-hat always be good!" has been Personally Signed by Dr. Seuss. This item is 100% Authentic to include a Certificate of Authenticity (COA) / hologram by Beckett Authentication Services. The authenticity can be verified on Beckett Authentication Services website.