Glass arabic weight from Armant. Glass weights were used to measure metals. Some weights have inscriptions with the name of the local governor or official in charge of measures. See Petrie's 'Ancient Weights and Measures'; Paul Balog's 1976 'Umayyad, 'Abbasid and Tulunid Glass Weights and Vessel Stamps'; George Carpenter Miles 1948 'Early Arabic glass weights and stamps. With a study of the manufacture of eighth century Egyptian glass weights and stamps, by Frederick R. Matson'. 101mm in diameter.