Reference: coin weigt? Of Usamah ibn Zayd with inscription and star sim to Balog, Paul. Umayyad, c Abbasid and Tulunid Glass Weights and Vessel Stamps. 20-21 very lightly struck, may be a test impression for a vessel stamp, otherwise the weight corresponds to 28 khar.
1982 Catalog Number: 5290
Registration Number: Glass - 026
Collection: Egyptian National Library and Archives