Hi,
It is a “cuchillo criollo”, (creole knife) pertaining to the Pampean flat grasslands of Sth America extending from southern Brazil to Uruguay and Argentina. These days it is classified as a `puñal’ on account of its false edge.
Judging by the coat of arms on the sheath, it is Uruguayan. See
https://es.wikipedia.org/wiki/Escudo_de_Uruguay
Referencing Domenech’s `Dagas De Plata’, the brand on the blade pertains to Solingen, that is, a German trade blade destined for the Sth American market, though I have been unable to find any more information . The 800 an the mouth of the sheath indicates the silver content.
Cheers
Chris