August Wilhelm Dieffenbacher ( 1858 - 1940 ) was a German painter. August Wilhelm Dieffenbacher s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 89.71 USD for Am Brünnl auf der Alm in 2006 to 2913.12 USD for Kvinnoporträtt in 2014 , based on the size and medium of the artwork.