This is a ring bezel with one end broken and missing. There is a design (animal?) lightly inscribed, and remnants of a light blue glaze. May join with 26-1-424.
From Egypt, Giza, Street G 7000. 1926: Excavated by the Harvard University–Museum of Fine Arts Expedition; assigned to the MFA by the government of Egypt.
Harvard University—Boston Museum of Fine Arts Expedition