This is a South-American Gaucho knife, dated circa 1900, with a makers stamp of “El-Casco, Solingen”. It was probably made in Europe for the South American market. The knife itself has a short straight double edged blade. The iron hilt and scabbard are nickel/silver plated, with beautiful floral decoration, and a sculptural chape/pommel.
There’s a large loop on the top of the hilt and a belt clip on the scabbard. A simple Google search of ‘El-Casco’ reveals that this knife was probably made by a company of the same name and logo, established in 1920 in Basque country of Spain making firearms, but now make luxury desktop accessories.