They also had a decorating studio in Limoges, France. My speculation is that this overglaze green stamp was provided for application on the whiteware after decoration with the flower pattern that was copied by the artists. This appears to be the stamp of the manufacturer of the board/paper used by artists for their creations.
Pattern name is Stamped label written in French which appears to say something about "Honorable Mention at Exposition Universelle of 1855, Papier, Carton, Chassis, Toiles, Anti-Ponce pour le Pastel, P. Apparently, he was given honorable mention for his products at the1855 Exposition.
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Though the factory closed in 1945 and this mark said to have been used after 1993, it is unclear as to what current name was/is used. https:// previously unidentified mark was identified by I don't know what the "OVID" is unless it was the name of the blank wares.