August Hermann Knoop ( 1856 - 1900 ) was a German painter. August Hermann Knoop s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 977.88 USD for Zwei Rokokokavaliere beim Studium von Graphiken. in 2004 to 4458.83 USD for A toast in 2008 , based on the size and medium of the artwork.