Thank you for viewing. This item was distributed at a cram school and used during class, then stored on a bookshelf at home. Upon inspection, there are no markings. There is a fold on the fourth book (please see photo 6), but the contents are relatively clean. However, as it has been handled by a person, there may be some surface scratches, so please check the photos and purchase only if you agree. Immediate purchase is welcome. Please feel free to comment if you have any questions.