Jacques, this is an extremely handsome example of plug bayonet and I am inclined toward your Spanish assessment as well. Spain used plug bayonets as hunting weapons as late as the 20th century, though they were typically fashioned in the traditional form and seldom ever used in the bayonet function, worn instead as 'hunting knives'.
This one is far more more decorated than the average hunting types with blade motif resembling officers swords, and the lattice decoration at the forte similar to 17th to 18th century European motifs. Another telling point is the fretted bolster around the bottom of the bulb of the grip, a feature I feel must be quite unusual, except on very well attended examples.
The features of the blade seem to me to favor late 17th into 18th with the symmetric fullers along blade edges, and the block ricasso, which to me seem to be in accord with strengthening for thrust as with many daggers.
In my opinion very likely to be high end plug bayonet for officer or perhaps gentry but still probably for hunting in accord with the fashionable events associated with social protocol. Hunting swords and these kinds of weapons were very much status symbols.
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