Northern Sung, Emperor Zhen Zong (1054-55AD), Iron 'Zhi He Zhong Bao' 3 cash with Reverse 'Tong' (mint place, Tongzhou, Shaanxi). 19.4g, Iron, 33.56mm. This is one the most precious iron coin in Northern Sung and ancient China. There are several types exist, i.e. plain reverse (common type), and rare reverse with the word 'He', 'Guo', 'Fang' and 'Tong'. Good fine and very rare.