1st Edition deals Harry Potter and the Half-Blood Prince 1st print British edition with error on page 99 eleven O.W.L.s RARE

This is a first edition, first print run hard-back British book Harry Potter and the Half-Blood Prince by J K Rowling, published by Bloomsbury. This was first issued with an error, on page 99 Ron is talking to Hermione about the exams and mentions 11 O.W.L.s but there are only 10, once spotted this was rectified in subsequent print runs. This example is in good condition, with original dust jacket, it has been read but there are no turned over deals pages or grubby finger marks.