Firmin Massot ( 1766 - 1849 ) was a Swiss painter. Firmin Massot s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 677.5 USD for Frauenbildnis. in 2004 to 59370.73 USD for Portrait de l'impératrice Joséphine in 2008 , based on the size and medium of the artwork.