This 9-1/4" early Spode "Frog Pattern" plate was made about 1826. It is marked "Spode's Imperial" in blue. The "Imperial" in the mark stands for a special earthenware body. The plate was difficult to photograph because of all the gilding.
This plate is in excellent condition. It has no chips, cracks, crazing or repairs. There is a little wear to the interior edge from being stacked over the years. It is marked in blue print: Spode's Imperial. In Godden's marks book, he says this mark was used from 1805-33.
Spode made this popular pattern in several colorways: this version is printed in blue, enameled over in puce, and then gilded. The pattern number
is 4233 (although not marked on this plate). The pattern was first recorded c 1826, The Potteries Museum & Art Gallery has an example of this pattern, which can be seen on the Spodeabc.blogspot.
In researching "Frog Pattern" , I learned it was "Used at the Coronation of His Majesty George the 4th - 19th July 1821."
According the the Spode Museum Trust's page on the Frog pattern: "Frog pattern has been produced in various versions from about the 1820s. No one really knows why it is called the Frog pattern and the name may have originated as a factory name - if you look at the outside of the pattern the shape is similar to a flattened frog!"