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Bedja Hadendoa Kunama Beni Amer sickle knife - 40 cm
https://anthro.amnh.org/anthropology/databases/common/image_dup.cfm?catno=90%2E1%2F%205950%20A
https://anthro.amnh.org/anthropology/databases/common/image_dup.cfm?catno=17%20%20%2F%20%20%2084%20AB
here Acquisition Year: 1869-1890
http://www.quaibranly.fr/en/explore-collections/base/Work/action/show/notice/192669-couteau-et-fourreau/page/1/
Lit.: Leuenberger,Hans; Äthiopien,Kaiserreich seit Salomon: S.197 - picture of a Kunama with such a dagger
eine den Beni Amer benachbarte Volksgruppe in Eritrea
E.S.Thomas: Catalogue of the ethnographical museum in Cairo 1924; pg. 56, fig.27
there it is reported that such kifes had been used for hamstringing horses.
W.O.Oldman's Catalogues of Ethnographical Specismens. cat.87 (1910), no. 15