Peter Sachs was a year old when the posters were taken
A Jewish man has taken a step forward in his fight to regain possession of thousands of posters he claims were seized from his father by the Nazis.
Peter Sachs, 71, who lives in Florida, claims the 12,500 rare posters were taken on the orders of propaganda minister Joseph Goebbels.
A court in Berlin has indicated it believes his father, Hans Sachs, was the owner when they were taken in 1938.
The German Historical Museum is challenging the case.
The museum is in possession of more than 4,000 of the posters, which include including advertisements for exhibitions, cabarets, films, and political propaganda.
Only a handful are on display at any one time, but museum officials say they form an integral part of its 80,000-piece collection.
The judges presiding over the case said they needed to deliberate whether further arguments were necessary before they could issue a verdict.
The Sachs family fled Germany shortly after the posters were seized, setting up home in the US.
They assumed the posters were lost forever, but in the 1960s Hans Sachs learned that a museum in East Berlin museum had some and wrote to the communist authorities about viewing them, without success.
He died in 1974 without seeing them again.
The collection was turned over to the German Historical Museum in 1990.