re: the Spanish marks, I don't find the mark in red on the action flats here
Yes, the marks in yellow are Scott's patent. I can't read the date or number.

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I appears to be a flag on a castle? It may be the mark of the importer, who could have been a gun maker?

The stars on the barrels are not a proof house mark and frequently found, having been placed by the maker, indicating choke.
1 star = full, 2 = improved modified, 3 = modified, 4 = improved cylinder, 5 = cylinder

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