Medieval ovoid jar with a narrow neck, with moulded decoration. Described as an "early Arab fire bomb" in the excavation report. Marked in ink by the excavator 1931-32, 579. Find number 31/579. From the Central City, Royal Estate, Royal Magazine (P.42.2; Petrie's no. 17). CONDITION NOTE 1998: Surface dirt, worn, chipped. Wellcome Historical Medical Museum accession no. 153XXX. Compare with other examples, such as UC59769 in the Petrie Museum of Egyptian Archaeology, University College London. Compare with two examples in 'A Manual of Egyptian Pottery, volume 4: Ptolemaic Period - Modern' p. 299 (Medieval 142-43).