Thanks all! Here are some pics, and some are taken from taking a picture inside the 40x zoom magnifier. These still don't quite capture it. There seems to be a transparent film within the glass slides, which I've researched was another technique used to make these. The zoom shows the texture of the transparent piece, and you'll notice, no dots in a pattern or halftone dots. It may look a little like it, but that's the texture of the transparency within the glass. It does seem plausible that this is a pic of a pic because it isn't as sharp as an original, but it still may be from the era. Next I'll show what a half tone picture looks like in a 40x zoom lens.
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