Belgian-born Empress of Mexico (1840–1927) and consort of Austrian Archduke, later Emporer Maximilian of Mexico. ALS in French, signed “Charlotte,” one page both sides, 5 x 8, gilt floral-bordered letterhead, no date. Letter from young Charlotte to her maternal grandfather, the French king, Louis-Philippe. In full (translated): “I would be so happy if I could give you a kiss while wishing you a happy name-day. But once again it will be dear Mother giving you a kiss for me. I pray God for you and hope that I will soon be able to see you. I am sorry to see dear Mother leave, but I am happy that you will have the pleasure of seeing her. Farewell, my dear Grandfather, I am sending warm kisses to you, and also to dear Grandmother; to the Uncles and Aunts, to all the cousins. I remain forever your respectful and loving granddaughter.” In fine condition, with a small spot of toning to lower portion and a pencil notation to blank second integral page. Accompanied by an unsigned carte-de-visite. RRAuction COA.