Lovely old coin you have there, I would be thrilled to have that in my collection.
As for your question of grade and whether it has been cleaned, I suppose the actual grade is irrelevant if it comes back with a cleaned mark on the slab, so I won’t bother adding my 2 cents on the grade. However I will jump in on the cleaning question as I think this might be more important to you.
My opinion from my experience of European silver coins is that it has been cleaned with a cloth at some point in its life, not recently though, maybe up to about 50 years ago or longer. Probably at a time when collecting coins wasn’t an extensive hobby and all silver was cleaned, your cutlery, cups, bowls and candle holders etc.
This wipe with the cloth has on a microscopic level smoothed off the surface on the inner part of the coin, so from the eagle out to where the text is, this has then resulted in the silver toning since it was cleaned but only in the places unaffected by the surface change, you can see this toning also in the field at the edge of the eagle where the cloth never reached. Likewise significant pressure was never applied to the fields where the text is on the outer part of the coin. Toning doesn’t just stop at the edge of letters without there being a change to the metallic surface.
All that being said, I quite like the toning which has been effected by an historical clean many years ago, some people might not agree, but I do not see why this should affect value. If it was encapsulated with NGC grade details and or cleaned I would still consider purchasing it because the cleaning is not harsh and the result is not unpleasant on one of the most overlooked grading criteria „eye appeal“.
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