1997及98年中国银行500元一对,编号AY256191及AY639736,均PMG 67EPQ,AY 字轨横跨1997及1998年,罕见的一对。 Bank of China, a pair of $500, 1.7.1997 and 1.1.1998, serial numbers AY256191 and AY639736, (Pick 332d, 322e), both graded PMG 67EPQ Superb Gem Uncirculated, the AY prefix is split between 1997 and 1998 and is scarcely offered together as a pair (2)