From the museum's website:
The Poster Collection documents the history of Swiss and international poster
art from the mid-19th-century to the present. The collection has been constantly
enlarged and updated to keep abreast of contemporary achievements as well
as to document historical milestones, and so has become one of the most comprehensive
and significant collections of its kind in the world today.
www.museum-gestaltung.ch
The museum holds over 300, 000 objects in it's graphics collection.