Bustle reports that the book measures just 1.6 inches by 2.4 inches and contains 31 pages of notes and sketches that correspond to the information Harry receives upon discovering that he’s been admitted to Hogwarts School of Witchcraft and Wizardry in the first novel. One page, for example, bears the inscription “Students may also bring an Owl OR a Cat OR a Toad [sic]” beside an illustration of an empty owl cage, while another reads "Parents are reminded that first-years are not allowed their own broomsticks.” The book also lists other school supplies necessary for new Hogwarts students, lines from Harry Potter and the Sorcerer’s Stone, and Rowling’s drawings of wands, cauldrons, witch’s hats, and more magical items.
Rowling created the pocket volume for a charity event in November 2004, where it fetched around $12,000 at an auction filled with tiny tomes written by Madonna, Sir Paul McCartney, and about 20 additional celebrities. The proceeds were donated to 999 Club, an organization that benefits the homeless population in south London.
Back then, fans were still waiting on the release of the final two books in the series (Harry Potter and the Half-Blood Prince and Harry Potter and the Deathly Hallows), and the third film (Harry Potter and the Prisoner of Azkaban) had just hit theaters that summer. Nearly 16 years, a theme park, a second film franchise, and a Tony-winning prequel play later, Rowling’s one-of-a-kind collector’s item is expected to sell for more than $180,000 this time around.