Isaac Grunewald (after) ( 1889 - 1946 ) was a Swedish painter. Isaac Grunewald (after) s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 68.12 USD for Pommac in 2010 to 912.85 USD for St Göran och Draken in 2014 , based on the size and medium of the artwork.