A glued book block was attached to the third side of the cover by gluing and was additionally pleated at the spine with fabric tape. The front cover can thus be folded away together with the cover spine, thus providing a view of the entire contents block. A special feature here is that the front cover is also folded in and holds another buck block. This is also glued and bonded to the front cover with the reverse side. It can be turned vertically rather than horizontally and is designed as a tear-off block. A window was imprinted on the front and back covers.