Edwin Knowles, the son of one of the founders of Knowles, Taylor & Knowles, founded his own pottery in Chester WV, across the river from East Liverpool OH, in 1900. In 1931 Knowles sold the Chester plant to Harker Pottery and moved his manufacturing to nearby Newell, WV. Nothing has been produced by the Edwin M. Knowles China Company West Virginia factory since the company went out of business in 1963. However a company that makes collector plates overseas bought the right to use the name, so you may find china with Knowles on the back that is quite recent. This category includes Knowles dinnerware from the 1900s-60s, not the collector plates. Most Knowles dinnerware has a date code under their backstamp, where the first two numbers indicate the year of production. Pattern names did not appear on dishes until the late 1940s, but earlier wares usually have a pattern number on the bottom of the creamer. This category includes patterns where only a pattern number is known, or where neither the pattern name or number is known at this time. Unidentified patterns that begin with an KNO number match Replacements Ltd. unidentified pattern classifications.