Klaas Boonstra ( 1905 - 1999 ) was a Dutch painter. Klaas Boonstra s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 226.47 USD for Man met vlieger in 2004 to 981.35 USD for Liggend naakt in 2004 , based on the size and medium of the artwork.