Use a strong light behind your plate -- such as a flash light in a dark room, and see if the plate is translucent. Can you see the light shining through? If you can, the plate is bone china, and it would have been made by Wildblood, Heath & Sons. Wm. Hackwood & Sons made earthenware c. 1846-49. Godden, in his book of British marks does not list impressed initial marks used by either firm. There were several firms with the name of Hackwood in the 2nd quarter of the 19th century, but the impressed mark usually seen is the name HACKWOOD. Godden shows a printed mark that is a cartouche with the pattern name, and the initials W. H. & S. The printed marks used by Wildblood, Heath & Sons include a crown, and most also have the words "Clifton China". See an example on p. 300 in my book along with an ad for the firm from the "Pottery Gazette" Jan. 1, 1923, and a picture of a lovely plate, cup and saucer with scalloped edges trimmed in gold. I'm sure your plate is lovely!
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