I have a set of six small (3-inches tall) footed cups/goblets. They are marked Los Castillo Taxco. I have the original bags they came in, since these were a gift in the early 1980s.
I "think" they are sterling. But the mark doesn't indicate they are sterling or plated or mixed metal.
A magnet does not stick to them.
There are no other marks than what is on the bottom of the cup.
Thanks so much for any assistance.

