Royal Crown, Pattern #905.
Tested with an XRF instrument. Positive for lead at 6,971 +/- 181 ppm. For context: the amount of lead that is considered toxic in an item intended for children is anything 90 ppm or higher. Vintage dishware is not regulated for total lead content as detectible with an XRF instrument. This dish was also “Non-Detect” (negative) for mercury (Hg), cadmium (Cd), and arsenic (As).
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