Erich Mercker ( 1891 - 1973 ) was a German painter. Erich Mercker s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 974.03 USD for Die Kölner Altstadt mit dem Dom in 2004 to 10000 USD for Fishermans` Boats In The Harbour in 2005 , based on the size and medium of the artwork.