u/Apprehensive-Fall347

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What is the object in the photos? In the hole on the top you can see some numbers engraved underneath. By rotating that part you can see that the numbering starts from 0 to 31 in a clockwise direction, but the numbers 9 and 19 are missing, and the number 1 is at a 90-degree angle to the knob that appears to be used to tie the object for carrying around. What is it? A perpetual calendar?

u/Apprehensive-Fall347 — 7 days ago