Sergei R Bongart ( 1918 - 1985 ) was an American painter. Sergei R Bongart s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 3672 USD for still life watermelon in 2005 to 11875 USD for Still life with sunflowers in a vase in 2013 , based on the size and medium of the artwork.