Joseph Siffrède Duplessis (after) ( 1725 - 1802 ) was a French painter. Joseph Siffrède Duplessis (after) s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 4560 USD for Portrait of Benjamin Franklin in 2005 to 13314.54 USD for Portrait du comte de Provence in 2013 , based on the size and medium of the artwork.