This 9-1/4" early Spode "Frog Pattern" plate was made c1805-1833. It has a gadrooned rim. The "Imperial" in the mark stands for a special earthenware body. It was difficult to photograph because of all the gilding.
Spode made this popular pattern in several colorways: this version is printed in blue and colored over in puce and gilded. The Spode Museum Collection holds an example of this pattern on a plate with the caption in script on the back: "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!"
The 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, which is Godden's mark 3656. He says the mark was used from 1805-33.