Banknotes have different security features which can be detected at IR (Infra Red), UV (Ultra Violet) and Magnetic Sensor.
2003 Series HK$1,000 Counterfeit Notes
In January 2015, the Hong Kong Police seized one new variation of the counterfeit HSBC HK$1,000 banknote (2003 series). This counterfeit banknote has two characteristics different from the previous seizure:
(1) The print dates in Arabic number and the Chinese character at the middle bottom of the counterfeit banknote were changed from “2008” to “2009”; and
(2) Under ultraviolet light, the counterfeit banknote shows a brighter and more prominent fluorescent barcode as compared to that of the previous seizure, which is similar to the genuine banknote.
How to identify the 2003 series $1,000 counterfeit notes
(*The above information is according to Hong Kong Monetary Authority website)