Jan Schoonhoven & Hans Sleutelaar ( 1914 - 1994 ) was a Dutch painter. Jan Schoonhoven & Hans Sleutelaar s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 1277.33 USD for 'Shape' in 2006 to 417782.33 USD for R60-27 in 2010 , based on the size and medium of the artwork.