I have it on good authority from a friend who viewed your photos that the sword is most likely of 18th Century origin (as indicated by the striated clamshells and hilt/pommel style) and is indeed Spanish (though he is of the opinion the blade was likely produced in Solingen). In particular, he is of the rather certain this is of the Spanish Colonial style associated with the Spanish Main and which is often attributed to Brazil. In fact, he helped identify a group of forty of these from a shipwreck off the coast of Panama several decades ago. Hope this helps.
