Q: As long as I can remember, my mother has had an unusual porcelain cup and saucer. Both pieces are marked in green with a crown and the words ‘Coalport A.D. 1750.’ The cup is 2 1/2 inches tall with straight sides. Its diameter ranges from 1 5/8 inches on the bottom up to 2 3/8 inches across the top. The matching saucer is odd. The recessed area for the cup is nearly an inch deep. Why?
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