Coffee cup : 44,000 ppm lead/
Bone China – Golden Crown – E & R, England
Rose Queen Series, Ena Harkness.
For context: the amount of lead that is considered toxic in an item intended for children is 90 ppm lead. Antiques and vintage items are not regulated and 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.