1981年汇丰银行$50,幸运号A/2 666666,PCGS Gold Shield 68OPQ ,罕见之幸运号。The Hongkong and Shanghai Banking Corporation, $50, 31.3.1981, serial number A/2 666666, blue and multicoloured,(Pick 184g), PCGS Gold Shield 68OPQ Superb Gem Uncirculated, a scarce lucky number