Roughly rectangular rubber with a flattened surface. Small chip included.
From Nuri, Pyramid XIII F.D. "SE" corner. 1918: Excavated by the Harvard University-Museum of Fine Arts Expedition; assigned to the MFA in the division of finds by the government of Sudan.
Harvard University—Boston Museum of Fine Arts Expedition
Nubian, Napatan Period, reign of King Harsiotef, 397–362 B.C.