Although sherds of Abbasid lustrewares have come to light in Khurasan and Central Asia, no early examples are known to have been made there. Until the late 12th century in these areas, a yellow slip underglaze was used to imitate the appearance of lustre. The eagle which decorates this bowl may well be a direct copy of a Mesopotamian original, or may hark back to a prototype Sasanian silver dish also showing a heraldic bird.