Your pieces are bone china with those pattern numbers on them. In Robert Copeland's book SPODE'S WILLOW PATTERN and Other Designs after the Chinese, pages 180 and 181 have lists of pattern numbers for the various Chinese Landscape patterns that were revived in the late 19th and early 20th century on bone china (a few stone china). I have found pink, azure blue, red and Baltic blue in the tea plates with Grasshopper border. They are lovely. I did an article about them in one of the issues of IWC News.
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