A certificate of authenticity by Mr. Klaus Ertz is attached, considering that the work is in a very good state of conservation. No retouching, pasty paint layer keeping the original color. Bibliography is attached at the end of the opinion. At the end of the study, examples are attached, as well as color photography. Van Kessel painted most of the time on wood and copper, considered a very detailed painter. It dealt with themes of still lifes, allegorical concepts, as well as the representation of the four Continents.