中华人民共和国国库券50元,1992年,背面漏墨错体, 许义宗教授藏品,十分罕见,边有微黄,十分罕见。People s Republic of China, State Treasury Note, 50 yuan, 1992, serial number X I 12722828, Printing Error, brown on multicolour underprint, a mining ship at right, reverse brown, colour missing at centre to bottom,(Pick unlisted), minor toned on edge, about uncirculated, a very rare and hardly seen modern Treasury Note error.