Rare in this part of the world, this a Argentinian Gaucho Knife.  A gaucho or gaúcho is a skilled horseman, reputed to be brave and unruly. The gaucho is a symbol in Argentina, Uruguay, Rio Grande do Sul state in southern Brazil, and the southern Chilean Patagonia. Gauchos became greatly admired and renowned in legends, folklore and literature and became an important part of their regional cultural tradition. Beginning late in the 19th century, after the heyday of the gauchos, they were celebrated by South American writers.