Currency (Hoe Currency) Central Africa; Cameroon; Mambila Iron 24 15/16 x 8 1/16 x 3/4 ins. (63.3 x 20.5 x 1.9 cm) Hoe currency is made of iron and may take various shapes: spade, teardrop or trowel. They can function as knives or blades, be used as a standard of currency, or in important transactions, such as bridewealth or a dowry. Hoe money was also often reformed into other objects or implements.