Siegfried Norbert Amerstorfer ( 1920 - ) is an Austrian painter. Siegfried Norbert Amerstorfer s works have been put up for auction numerous times, with realized prices varying from 184.05 USD for “Bäume im Sturm” in 2005 to 558.61 USD for Waldlandschaft in 2006 , based on the size and medium of the artwork.