Help, blank Kennedy Planchet? I don't think so.

I bought this off eBay as a blank Kennedy 50c planchet. It's not though because:
- It only weighs 9.60 grams (should be ~11.34 if today's composition).
- It's slightly smaller in diameter than a Kennedy Half.
- It's thicker than a Kennedy Half
- It has rings, like the cross-section of a tree trunk.
Any ideas?

- It only weighs 9.60 grams (should be ~11.34 if today's composition).
- It's slightly smaller in diameter than a Kennedy Half.
- It's thicker than a Kennedy Half
- It has rings, like the cross-section of a tree trunk.
Any ideas?

My humble '63 mint registry set, not much, but it's mine!
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edit: messed the thicker part, but I stand by it being turned from a larger piece.
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Interesting, I didn't think about that, thanks.