In referring to certain types of pottery, "Leeds" and "featheredge" are both common misnomers. People think of certain types of Staffordshire pottery as being Leeds while in actuality only a small portion was made by that factory.
Further, to be completely accurate, this platter is really what is known as "shell-edge", as opposed to featheredge. It is pearlware, made around 1810, and is an extremely large 17 3/4" by 13 1/4" in size. Wares of this type were often made in blue, and, much less commonly, in green, which is highly sought after and commands a price premium over the blue.
The platter is in excellent condition, with no cracks, scratching , or enamel loss. There had been a tiny glaze flake of less than 1/16" at the very edge of the rim, but that was invisibly touched up.