Ok, my go at it, knives, and specially of such a late date, being a bit off my speciality...
The shape and decoration screams Spanish, Albacete, 19th. C, maybe even late 18th. Such fullers on the blade of these are not unusual, by the way.
Things that put me off: the Albacete knives had their metallic parts (aside from the blade, of course) made of brass/bronze, not silver, which is material more usually found in, for example, the South American "cuchillos criollos" ("Criollo" knives, sometimes also called "gaucho" knives). Also, the pommels, when present, tend to be smaller.
In short, it could be a variation, particularly rich, of an Albacete knife. My bets would surely go in this direction. If it would happen to be a "colonial" variation, improbable as I believe it to be, I wouldn't be surprised, tough.
My two euro cents...
Marc
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