Georgian, Old Sheffield Plate, warming entree dish or bain marie. Circa 1820 - 1830.Georgian, Old Sheffield Plate, warming entree dish or bain marie. Circa 1820 1830. Features gadrooned border and twin handles to the sides. The handle to the cover is fixed, but the cover can be removed if required. The underside features a screw cap reservoir to allow boiling water to be poured in. The dish itself is shallow, perhaps for eggs or bacon. A crest of a swan is featured on the cover and is formed from a rubbed in square of silver. The