The Tumi is a type of ceremonial knife used in Ancient Peru by the Moche, Chimú and Inca cultures. It is normally made up of a single metal piece. The Tumi handle is rectangular or trapezoidal in shape. Pre-Columbian Andean art (especially Moche art) clearly shows the beheading of prisoners with tumis.
It is known that the ancient Peruvians treated their wounded (common in war, used blunt clubs as primary weapons) severe head injuries by cutting and removing the damaged part of the skull (cranial trepanation). These operations often allowed the wounded to live, as evidenced by archaeological evidence of trepanned skulls found primarily off the southern coast of Peru.
Measure 1.3