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These two solid cast brass hairpins are from or one more of the various peoples of the Congo. These examples probably are from the Kuba people.
It is likely that they were worn by senior men to keep headdresses in place.
Each has a tiered terminal reminiscent perhaps of a grain store or some other architectural structure.
Related examples are illustrated in Ginzberg (2000, p. 228) and van Cutsem, (2005, p. 54).
The two here have clear age and golden patinas. They are in excellent condition.
van Cutsem, A., A World of Head Ornaments: Africa, Asia Oceania, America, Skira, 2005.
Ginzberg, M., African Forms, Skira, 2000.