Birthday letter from Adolf Hitler. Fantasy product - it never existed, though it's based on a real certificate - namely on the 50th wedding anniversary congratulatory letter from the Führer. 
Folded in half fits perfectly in #10 envelope (4.125 x 9.5"; 104.775 x 241.3mm). Add first class post stamp and send this original card to a friend! 
Consider adding one of the autographed photos of Hitler - you can find a selection here.