Enamelware mug purchased c. 2014 at New Seasons Market in Portland, Oregon. Exterior tested positive for 15,000 ppm lead. No mark or maker noted. Tested with an XRF in 2014.
The amount of lead that is considered toxic in a modern/newly manufactured item intended for children is anything 90 ppm lead or higher. Mugs are not considered items intended for use by children and, as such, are not regulated for total lead content as detectable when tested with an XRF instrument.