That stuff looks an awful lot like the "damasquinado" [damascene- derivitave of 'Damascus'] items from Toledo, except with a little more clay involved in the initial production.
I do plead ignorance, though, as I've yet to visit Sevilla, after having visited most of the other major [and a myriad of minor] cities in Spain.
I think I prefer the items from Toledo.
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Ongi etorri!