- German-Jewish dentist Dr. Hans Sachs was one of the world's first and largest collectors of poster art
- His vast collection was stolen by the Nazis when he was arrested in 1938
- 100 of his valuable posters will be auctioned in London on June 8
(CNN)Dr Hans Sachs had a passion for posters. Smitten with the bold graphics and experimental style of early 20th century poster design, the German-Jewish dentist began a collection that spiraled into the thousands and featured the leading artists of the era.