Scans from: Hammond, W. G., & Scull, C., 1995. Tolkien: Artist and Illustrator. Harper Collins: London
Facsimile of a page from the book of Marzabul.
Tolkien apparently aged it himself, including putting genuine burn marks on it and puncturing holes for where the binding would have attached. He was extremely disappointed it didn’t make it into the published version of LotR.