It seems this person has personally detected the presence of lead in older corningware: https://tamararubin.com/2019/03/how-much-lead-is-in-my-vintage-corning-casserole-here-are-pictures-of-each-one-i-have-tested-with-links-to-the-post-with-test-results/
There’s one in New Mexico that plays America the Beautiful.
https://www.atlasobscura.com/places/musical-highway
It seems this person has personally detected the presence of lead in older corningware: https://tamararubin.com/2019/03/how-much-lead-is-in-my-vintage-corning-casserole-here-are-pictures-of-each-one-i-have-tested-with-links-to-the-post-with-test-results/