This Autographed & Framed Bart Simpson Sketch with the inscription of "9-21-1991" has been Personally Signed by Matt Groening of The Simpsons. 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. This item has been professionally framed to overall dimensions of approximately 21.5 x 23.5 inches.