1990年国库券一对,面额10元,均相同编号X IX 5159797, PCGS 55. 中国人民银行. China, Peoples Republic, State Treasury Note, a pair of 10 yuan, 1990, identical serial numbers error notes, both bear the number X IX5159797, (Pick unlisted), PCGS 55 About Uncirculated, extremely rare.(2)