There are a number of pieces of glazed relief ware decorated in fashions similar to that seen in the present flask, which most authorities write about as a coherent group. Vessels and fragments have been found in a number of Early Islamic sites, including Samarra, Susa, Rosen-Ayalon, Hira, al-Mina and Tarsus. Very few vessels have however survived intact from this group.
A very similar piece to the present jug is in the Khalili Collection. Both are covered with a very well preserved rich green glaze over moulded decoration (Grube, Ernst J.: Cobalt and Lustre, The First Centuries of Islamic Pottery, London, 1994, no.13, p.19). The meandering vine over the shoulder of the Kkhalili vessel is also very similar but slightly tighter than that on the present jug. Another jug of the same technique but different decoration was sold in these Rooms, 13 October 1998, lot 281.