It is a disc lid. It has ground edges for cover. The underside is concave. The surface is scratched. It is chipped and unevenly made.
From Egypt, Zawiyet el-Aryan. 1911: excavated by the Harvard University–Boston Museum of Fine Arts Expedition; assigned to the MFA in the division of finds by the government of Egypt. Findspot Information: From Zawiyet el-Aryan 500. Z/500/x
Harvard University—Boston Museum of Fine Arts Expedition