Amadeo Grassi ( 1725 - 1796 ) was a Italian painter. Amadeo Grassi s works have been auctioned off multiple times, with realized prices varying according to the size and medium of the artwork, for instance of 2989.48 USD for Portrait of Queen Maria Antonia (Antoinette) Fernanda of Sardinia, Duchess of Savoy and Infanta of Spain (1729-1785) in 2012