Indus Valley Cylinder Bird Seal Replica (resin casts). Two birds pictured from the Indus Valley. About 7/8 of an inch by 3/8 inch round. The Indus Civilization and Sumeria traded both overland, through the Elamo-Dravidian corridor, but also up the Persian Gulf with Dilmun (Bahrain) as a midway base. From Mecheherghara Balochistan, Pakistan about 1500 BC.