Clarence Bone China, Made in England, Teacup: 56,700 ppm Lead.
For context, the amount of lead that is considered unsafe in newly manufactured items intended for use by children is anything 90 ppm Lead or higher in the paint, coating or glaze.
Antiques and vintage items are not regulated and when selling them (in most cases) it is not required to mark them as containing lead (and being potentially hazardous) as it is required with many newly manufactured items.
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