A trumbash or trombash is a Mangbetu throwing knife from the Democratic Republic of the Congo.
Uses Similar to a sickle, the trumbash was used as a throwing weapon or as currency.Alfred Mahieu, Numismatique du Congo, 1485-1925 : instruments d'échange, 1925, p.23Belgisch tijdschrift voor numismatiek en zegelkunde, 1922, p.41 The handle is usually made of wood, but it can be made of ivory or bone. It is more or less decorated, according to the rank of its owner and the use that is made of it.Werner Fischer, Manfred A. Zirngibl, African Weapons: Knives, Daggers, Swords, Axes, Throwing Knives, 1978, p.67 The curved blade is made of iron.
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References
Bibliography Jan Elsen, De fer et de fierté, Armes blanches d'Afrique noire du Musée Barbier-Mueller, 5 Continents Editions, Milan, 2003, Tom Crowley, Andrew Mills, Weapons, Culture and the Anthropology Museum, 2018