The Museum of Fine Arts in the Swiss capital, Bern, and the Art and Exhibition Hall in the German city of Bonn will hold concurrent exhibitions of artworks from the collection of Cornelius Gurlitt in the coming winter months.

A recluse in Munich, Gurlitt died in 2014, leaving a massive art trove to the Bern museum. He inherited the collection from his art dealer father, Hildebrand, who worked with the Nazis.

Provenance research has been slow on the long-hidden hoard of 1,500 artworks. Since discovered in 2012, only 5 works have been determined to be looted while some experts say 590 works could have been acquired in forced sales or stolen from Jewish families and museums during the World War II era.

“The exhibitions at the Art and Exhibition Hall in Bonn and at the Fine Arts Musuem in Bern are planned for winter 2016/17 and their content will be coordinated,” the two museums said in a joint statement.

“The exhibition at the Art and Exhibition Hall in Bonn will deal more specifically with the history of the collection, and it is hoped it will contribute to further investigation of the provenance of the works.

“It will also focus on the fates of persecuted art collectors and their collections.”