Breaking two days of silence following the revelation of the spectacular discovery, Meike Hoffmann, the chief expert aiding the investigation, said the Chagall painting, an allegorical scene dating from the mid-1920s, had a "particularly high art-historical value".
The Dix work is a rare self-portrait probably painted in 1919, she added.
Hoffmann showed slides of the paintings, which also include works by Pablo Picasso, Pierre-Auguste Renoir and Henri Matisse, at a news conference in the southern city of Augsburg where the German authorities shed light on the extraordinary find in the apartment of an eccentric elderly loner.
Hildebrand Gurlitt had been one of a handful of art experts tasked by the Nazis with selling valuable artworks stolen from Jewish collectors or seized among avant-garde works deemed to be "degenerate".
Augsburg chief prosecutor Reinhard Nemetz said 1,285 unframed and 121 framed paintings, sketches and prints, some dating back to the 16th century, were found in the rubbish-strewn flat.
Focus magazine, which broke the story this week, had reported that the collection comprised 1,500 works worth an estimated one billion dollars (USD 1.3 billion).
Determining which works were looted from Jewish collectors by the Nazis or taken from them under duress for a pittance would be a lengthy process, Hoffmann noted.
In a moment of high drama at the news conference, Hoffmann flicked through slides in the darkened room showing works that had not been seen in public in seven decades.
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