Manuscript Book is just a different name for a Case Bound Notebook. They too are of premium quality and highly durable. Their cover page is more of a classical design.
The pages are folded in a section to be ready for thread sewn. The case is made by pasting the printed sheet over 3 pieces of the board. The front, back and the spine form the part of the case board ensuring enough strength and protection to all sides of the manuscript book. The end sheets are inserted separately or the first and last pages of the folded section sewn book are glued into the case.