Chinese Coin Shipwreck Concretion Northern Sung Dynasty The Chung Hur Fleet plied the Gulf of Siam from 1420 – 1438 sailing to all points in Asia and Africa eventually returning to China. This concretion, salvaged from one of these large junks, contains many hundreds of coins that are 500 to 1,000 years old. Length: 12.25” Height: 6.5” Depth: 4.5” Weight: 11 lbs. 6 oz. Price: $3,000