Small stone for grinding. It is not quite flat. Similar to 17-4-517.
From Nuri, pyramid VIII, northeast foundation deposit. 1917: excavated by the Harvard University-Museum of Fine Arts Expedition; assigned to the MFA by the government of the Sudan.
Harvard University—Boston Museum of Fine Arts Expedition
Nubian, Napatan Period, reign of Aspelta, 593–568 B.C.