Here is something about pewter:
"Early-modern Spain was not well regarded for its pewter production, though a small industry did exist there. More typically, as is reflected from these pieces, the Spanish imported their pewter goods from other European countries, especially England. Pewter is consistently found on Spanish shipwrecks from throughout the colonial period, though there has never been a large number of pieces from any particular one. From such evidence, it is difficult to discern exactly how pewter was valued by the Spanish."
But what your post says at the site reminds me of the site they claimed was the Juno.