Ad Blok Van Der Velden ( 1913 - 1980 ) was a Dutch painter. Ad Blok Van Der Velden s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 1523.07 USD for TEXEL in 2004 to 2161.16 USD for Boerderij in landschap in 2007 , based on the size and medium of the artwork.