Update (Saturday 2.11pm): Daniel O. McClellan brings into a post of its own something that he had previously noted in comments, to the following effect:
Besides the numerous reasons Elkington’s credibility has been eradicated, at least one portion of the bronze plate analyzed by Thonemann was pressed or cast from the exact same die or mold as one of the lead plates currently making the rounds. Below you can see the tree from the old bronze plate and the tree from one of the newer lead plates. They are absolutely identical. They ca me from the exact same die or mold. The lead plates are forgeries just like the bronze plates.Daniel has helpful illustrations too. Great work.