This is one openwork Eye of Horus (wedjat) amulet with a serrated edge. It is also pierced horizontally for suspension.
From Egypt, Giza, St G 7000, debris E of subsidiary Pyramid G 1-b. 1924: excavated by the Harvard University–Museum of Fine Arts Expedition; assigned to the MFA in the division of finds by the government of Egypt.
Harvard University—Boston Museum of Fine Arts Expedition