That's because its original owner was evidently Joseph Smith Jr., the founder of The Church of Jesus Christ of Latter-day Saints.
"It is in fact, unique," said rare books dealer Ken Sanders. "It's the only copy in the world, the family Bible belonging to the founder of Mormonism and his first wife, Emma Hale Smith."
Sanders has been keeping the book locked up in a safe at his Salt Lake City store while he looks for a buyer. He said the 1831 edition of the Bible was originally purchased by Joseph Smith Jr. when the family lived in Kirtland, Ohio. It's been out of sight for many years, apparently cherished for generations by descendants of Emma Hale Smith. In 1979, the Smith family sold it to a friendly outsider, Buddy Youngreen. He published photos of it in the LDS "Ensign" magazine in 1984.
The current owner is something of a mystery. Youngreensaid he sold the book 15 years ago to an anonymous buyer. Sanders said he's been asked to sell it on consignment for a family that has asked to remain anonymous.