Joseph Siffrède Duplessis ( 1725 - 1802 ) was a French painter. Joseph Siffrède Duplessis s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 576000 USD for PORTRAIT OF BENJAMIN FRANKLIN in 2005 to a remarkable record 1445000 USD for PORTRAIT OF BENJAMIN FRANKLIN in 2015 , based on the size and medium of the artwork.