Although unmarked, this gadroon-edged porcelain plate is definitely Grainger, Lee & Co.'s pattern 1492, described in the pattern books as "5-petalled flowers around borders, flowers growing out of a pot in the center", as noted on page 223 of "Grainger's Worcester Porcelain", by Henry and John Sandon. I have a single matching plate with that pattern number handwritten on it. The plate dates c 1825.
The plate is 8-7/8" (22.5 cm). Its condition is very good. There are no chips, no cracks, minimal crazing, and no repairs. There is wear to the gilding of the rim. There is a light brown spot on the back, likely done during the firing. It does not ring when tapped.
I have several of these plates. Only one has the full pattern number 1492 hand painted in red (quite small) near the footrim. This plate does NOT have the whole pattern number on it, just the last two numbers: 92. Many pre-1840 pieces from this maker were not marked.
I also have for sale a matching gadroon-edged dessert centerpiece. Its shape can be seen in the Sandon's book, plate 61.