The unidentified Dutch painting in Joseph Losey's Mr. Klein (1976)

Courtesy of http://books0977.tumblr.com/post/79131537185/analysis-1666-adriaen-van-ostade

The frame on the left, below the bookshelf, is the kind of object of which Cornelis Norbertus Gysbrechts did trompe l'oeil paintings.

 

 

 

More material on the reverse sides of paintings.