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[Updated: There are now pictures of both top and side views. Scroll to bottom of post to see the side views.]

While sorting through family artifacts, I found a black metal two-layer disc with a long spindle. One layer (marked "This Side Up") was about 5 1/2 inches in diameter; the other about 4 1/2". The smaller disc had an inside ring with what appears to be lettering or symbols. See photos (four in all) for various views.

What is the object?

mystery object dual discs and spindle

enter image description here

  • 1
    Do any of the parts move or spin? – Aaron Brick Oct 2 '18 at 0:29
  • 5
    Dammit, I've seen one of these before...I assume that's just a random piece of cardboard, and not the packaging the thing came in. – Spencer Oct 2 '18 at 3:21
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    @Spencer Know how you feel, me too, just can't remember where / when. I'm wondering if this question might not do better on something like Engineering SE. – Lars Bosteen Oct 2 '18 at 4:19
  • 4
    I've asked the moderators for those two sites whether they think the question is a good fit. Mechanics declined the migration and engineering did not answer two queries. I don't think we can migrate. (one of the mechanics mods is intrigued by the question, but can't answer it.) – Mark C. Wallace Nov 25 '18 at 22:10
  • 2
    It looks like part of a turntable: google.es/… – Alberto Yagos Nov 27 '18 at 18:57

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