This is a corner fragment inscribed with the 'di' loaf and a horizontal incised line. Although it joins 20.1176a-d, the stone and style of carving are different. This is coarse alabaster.
From Nubia (Sudan), Kerma, K X corridor 5-3. 1914: Excavated by the Harvard University–Boston Museum of Fine Arts Expedition; assigned to the MFA by the government of Sudan.
Harvard University—Boston Museum of Fine Arts Expedition