2020 Marsh Billings Rockefeller Silver Proof

[Kingcoin]

Finned rim?
Out of collar?

[MintErrors]

Finned rim?
Out of collar?

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In my opinion, this looks like a partial collar. From what I can see of the reeding on other parts of the coin, it does look sort of normal.
I've never seen a mis-aligned die (MAD) look like this, but technically - the definition fits.

Does the reeding look normal on the non-affected area of the coin ?

By the way.... PROOF errors can demand a significant premium. Although this forum does not like us to chat about prices, you might be able to find some pricing on the website https://minterrornews.com under price guide and under the proof errors category. It will give you a ball park idea what it might end up going for.

[Kingcoin]

Thanks for that information. It shows clad proofs but not silver proofs. Silver proofs should be more rare then clad proofs. Also, the reading looks sheared from the die so much so that a sliver of it remains attached to the coin in a looping fashion attached at both ends.