English summary: The Berlin call numbers series "Hdschr." contains the manuscript acquisitions of the State Library of Prussian Cultural Heritage (SBPK) from the early 1950s, at that time still located in the Hessian library in Marburg, to 1997, when the manuscript departments of the Deutsche Staatsbibliothek on Unter den Linden and the SBPK in Potsdamer Straae were merged."Hdschr." was initially meant to include any newly acquired hand-written...