Benjamin West (after) ( 1738 - 1820 ) was a British painter. Benjamin West (after) s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 352 USD for William Penn´s Treaty with the Indians in 2004 to 28125 USD for PORTRAITS OF A GENTLELMAN AND A LADY in 2011 , based on the size and medium of the artwork.