10 Pfennig white numeral in circle, medium carmine, single franking, single-circle STUTTGART, aristocratic letter to "Her Serene Highness Princess Henriette von Schleswig-Holstein, married Privy Councillor Esmarch, Kiel". Princess Henriette von Schleswig-Holstein-Sonderburg-Augustenburg was married to famous surgeon Friedrich von Esmarch and aunt of German Empress Augusta Viktoria. Very attractive condition with famous addressee, unsigned, Thomas Heinrich BPP short opinion (2025) "faultless"