Otto Coenen ( 1907 - 1971 ) was a German painter. Otto Coenen s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 598.92 USD for Landschaft mit Häusern (Oberkassel) in 2002 to 1064.07 USD for Bäume in Oberkassel in 2006 , based on the size and medium of the artwork.