Very large copper Tumi

Metallurgy was the primary medium for the expression of the power of Sicán rulers; vessels, headdresses, body adornments, funerary masks, and tumis were delicately made from arsenical copper.

Tumis are ceremonial knives with semicircular blades. Known on the Peruvian coast since the third century B.C., they often appear in Moche iconography, where they are used to cut the throat of sacrificial victims. 

Tumis were also recently found in situ in the tombs of high-status Moche and Sicán individuals.

Sicán tumis such as this one were exquisitely crafted by skilled metallurgists mastering the techniques of repoussé, soldering, and filigree.