Rococo was first made by the Homer Laughlin China Company in 1891. By the early 1900s it had been phased out and was no longer listed in catalogs after 1906. Pieces are generally marked with the "eagle over lion' backstamp. The Bersback, Cummings & Co. advertisement below ran in the Pottery and Glassware Reporter in the early 1890s. The pieces shown on the left are Rococo while the combinet on the right is the Lenox shape.
Rococo is not the easiest of HLC shapes to find. It can be found plain or with decals and/or gold decoration.