Russian aristocrat (1887-1967) best known for participating in the strange and storied assassination of Grigori Rasputin. Bold vintage ink signature, "To Frank M. Flack, With the author's compliments and best wishes, Prince Youssoupoff, Paris 1954.,” on an off-white 5 x 3 card. In very fine condition. Accompanied by the original mailing envelope, postmarked November 12, 1954.
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