This Autographed Dated December 22, 1888 Auto Graded Gem Mint 10! Handwritten Recommendation Letter has been Personally Signed by Thomas Edison. 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. Letter reads in full: "Daniel McRorie has worked for us for three years as an assistant to the Gardener. He is a good worker, competent, and of good habits - Thomas A. Edison.