Portuguese silver

I would like to know if anyone can identify the designer who signs it as “F.A.” The metal has Portuguese gold and silver markings.

I bought a ring for about $15 because I saw potential in it. Unfortunately, I was unable to photograph the hallmarks on the ring because they are very small, but I was able to examine it with a magnifying glass. It is 925 silver from the Porto region, with 800 gold. It has the silversmith’s symbol, something with an N highlighted.

Thank you in advance.

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No idea… ----:cry:___ :sob:----

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