Here's a very nice Autograph Note Signed by Thomas Alva Edison, May 5, 1910, to C. C. Buel.  Edison writes: "I am so very busy that I really had no time to correct the article, it reads rather poorly[;] so you better fix the grammar up - writing is out of my line."

Guaranteed authentic.  Several chips and splits professionally mended.  Approx. 5-1/2 x 8-3/4 inches.