Here is a link to a youtube video (in German, which I do not know) which has many images that shed light on this dial. There are some string accessories that seem nomographic that I do not understand. At 11' 30" the video seems to show a small angled mirror in the center of the base but I can't discern its function. https://youtu.be/veIM6xheY04?si=1w_IowZZs03NPS4_
-Bill
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