Glass jeton. Islamic, Fatimids. al-Mustansir billah, AH 427-487 (AD 1036-1094). Semi-transparant yellow/green glass (15mm; 1.47g). Intact but with roughness around edge and on back. P. Balog, "The Fatimid glass jeton," AIIN 20 (1973), 273; Album 724.
From the Carl Devries Collection.