With the factory mark in blue and the painter’s mark of a line. Four blue dots in a line for gilding by Pierre-Théodore Buteux (known as ‘Théodore’ active at Sèvres 1765-80). With the gilded mark # for the gilder Michel-Barnabé Chauvaux (active at Vincennes and Sèvres 1752-88). Incised JR and oag