This deep yellow notebook (the yellow color is slightly darker than shown here) has the classic format of a pocket organizer, such as offering him the big leather goods manufacturer. It thus fits in your pocket. The hard cover is easily pliable, but not too strong, and considers it good when you write standing up in.
169 pages, acid free paper, the table of contents would have not used (too small format!). With Pencil you can very well write it.
"LEUCHTTURM 1917" .................................... yes, this name fits!