Reference: Hartill 16.1
Song Yuan Tong Bao
Weight: 4 grams, Size: 24 mm, Bronze
Emperor Tai Zu (960-76)
Song Yuan tong bao. (Chinese: 宋元通寶; pinyin: sòng yuán tōng bǎo). Written in li script. The inscription is based on the Kai Yuan coin. It has a nominal weight of 1 qian. Various dots and crescents are found on the reverse. It was first cast in 960 and then until the end of Tai Zu's reign. Casting of iron coins started at Baizhangxian, Yazhou, in Sichuan, from 970. Ten furnaces cast 9,000 strings a year.