The painting is based on the central panel of the painting in the Museu Arte Antiga in Lisbon.

There are about 25-30 similar paintings, for example in the Musée de l'Art Wallon (31.5 x 47.5), Sotheby's in London 2005 (37.5 x 56.5) and De Jonckheere 2012 - all deviating is for example the upward protruding point on the left side of the tower