This is a modern brass button . One side is stamped with "HDH & Co. Superior" and there is a small ring in the center of the stamped side.
From Egypt, Giza, Street G 7000, Debris East of Pyramid IB. 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