Otto Erdmann ( 1834 - 1905 ) was a German painter. Otto Erdmann s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 8253.92 USD for STELLDICHEIN BEIM CELLISTEN in 2007 to 14705.88 USD for The 70th Birthday in 2011 , based on the size and medium of the artwork.