Immensely popular writer of mysteries (1890–1976) whose aggregate sales have exceeded four billion books, making her, along with Shakespeare, one of the best selling authors of all time. Vintage ink signature, “Agatha Christie,” on an off-white 5.25 x 7 sheet. In fine condition, with a bit of scattered mild toning and a horizontal fold below signature. Accompanied by the original mailing envelope, addressed in Christie’s hand, and postmarked November 16, 1950. RRAuction COA.
