Egbert Rubertus Derk Schaap ( 1862 - 1939 ) was a Dutch painter. Egbert Rubertus Derk Schaap s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 1055.19 USD for Partie in Amsterdam in 2004 to 1186.32 USD for De zondagmiddagwandeling in 2009 , based on the size and medium of the artwork.