Question: When did the former wife of Graf von Bismarck-Schönhausen donate a piece to the Smithsonian she purchased on her honeymoon with a different man?
Sentence (from "Mona von Bismarck"): Mona von Bismarck (February 5, 1897 – July 10, 1983), known as Mona Bismarck, was an American socialite, fashion icon, and famed beauty.
Relevant evidence: Yes