It is the sixth painting returned from the art collection of the late Cornelius Gurlitt, who had inherited the paintings from his father, Hildebrand Gurlitt, who worked acquiring art for the Nazis.
The work by 19th-century French painter Thomas Couture had belonged to Jewish politician Georges Mandel, and was identified due to a tiny hole in the canvas. Restitution to his heirs is in the works.
The aim of the exhibition is to clear up provenance questions in the collection of the late Cornelius Gurlitt; some works likely were looted from Jews and museums during World War II.