Liberty Blue Staffordshire Ironstone Vintage Plate: 44,500 ppm lead.
The amount of lead that is considered toxic in an item intended for children is 90 ppm or higher. Vintage china is not regulated in any way.
Please note: I am not saying “this particular plate will poison the people using it”! I am saying that there is no defensible reason for one of the most potent neurotoxins known to man to be in our cookware (especially at levels this high!) Period.