Roland,
Interestingly, it also mentions that the Trommelmagazin was destined for the Lange Pistole 08, although it's use and service is described in the MG18 section.
The book contains some pencil written remarks and drawings (especially for handgrenade throwing

) by the owner, a mr. August Siebert.
It has his name in ink, his last name in pencil and also his initials in pencil on page one.
The C/96 section is 10 pages long and describes, like the P08 section, the basics of the pistol, technical features, possible malfunctions and solutions.