Shanghai England Plate and Mark

Q: I have a piece of blue and white pottery with this diamond-shaped mark on the bottom. I found it during an archeological excavation. I haven’t been able to identify the maker. Can you help?

A: The mark with “W” in a diamond was used by W. & E. Corn c.1900. “Shanghai” is the pattern name. Edward Corn founded a pottery at Burslem, Staffordshire, England, in 1850. His sons, William and Edward, took over the pottery c.1864. William died in 1885. The pottery moved to Longport in 1890. After Edward’s death in 1891, his sons Alfred and Edmund took over the pottery. The pottery continued to operate as E. & E. Corn until 1904.