Montereau 6 plates faience fine white pearl restoration before 1819 hollow mark

6 flat plates, with entremet or dessert, in fine faience, of the manufacture of montereau, called "pearly white" (in reality bluish gray), period 1st empire or restoration, before 1819, mark in hollow only montereau france, before the merger with the manufacture of creil which took place after 1819. Monogram "j. Y.", hollow at the bottom, hectic border, perfect condition.