Fragment silver. Apparently inlaid with gold. Looks like horn from ATEF crown
From Nubia (Sudan) Gebel Barkal Tomb B 501. 1920; Excavated by the Harvard University-Museum of Fine Arts Expedition; assigned to the MFA by the government of Sudan.
Harvard University—Boston Museum of Fine Arts Expedition
Nubian, Napatan Period, 750–250 B.C.