The incomplete work is the earliest surviving manuscript for a novel by Austen, probably written in 1804 but not published in Austen's lifetime.
It centers on a family of four sisters, the daughters of a widowed clergyman
Sotheby's says it is the only major manuscript by the author still in private hands.
Austen published six novels, including "Pride and Prejudice," and died in 1817 at age 41.