type of plate
Because of the curve to the plate this looks very much like a gravure printing black printing plate. They use that kind of printing for large runs. It bee around a long time. The line screen should be pretty detailed about 133 to 150 line screen. If it were for a news-paper the number of dots per inch (line screen) should be 115. You can use your 10X loop and just count them. Its not that hard. That should give you a much better Idea of what kind of substraight (paper) it was used to print on. And will narrow your search. Hope that helps
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