The twenty-dollar note was first issued by the

Oriental Bank Corporation The Oriental Bank Corporation (), or "OBC", was a British imperial bank founded in India in 1842 which grew to be prominent throughout the Far East. As an Exchange bank, the OBC was primarily concerned with the finance of trade and exchanges of ...

from 1866 to 1884. These banknotes are not very common and are listed as extremely rare. Apart from this, the banknote was reintroduced in 1985 by the

Standard Chartered Bank (Hong Kong) Standard Chartered Hong Kong (officially Standard Chartered Bank (Hong Kong) Limited, ) is a licensed bank incorporated in Hong Kong and a subsidiary of Standard Chartered. It is also one of the three commercial banks licensed by the Hong Kong ...

in green and yellow, followed by

The Hongkong and Shanghai Banking Corporation The Hongkong and Shanghai Banking Corporation Limited (), commonly known as HSBC (), was the parent entity of the multinational HSBC banking group until 1991, and is now its Hong Kong-based Asia-Pacific subsidiary. The largest bank in Hong K ...

in 1986 in similar colours, but more green involved. The

Bank of China The Bank of China (BOC; ) is a Chinese majority state-owned commercial bank headquartered in Beijing and the fourth largest bank in the world. The Bank of China was founded in 1912 by the Republican government as China's central bank, rep ...

issued their version in 1994 as a blue coloured banknote. These were standardised in 2004 when all three types of banknotes were changed to a blue colour.

References

*Ma Tak Wo 2004, Illustrated Catalogue of Hong Kong Currency, Ma Tak Wo Numismatic Co., LTD Kowloon Hong Kong. Banknotes of Hong Kong Twenty-base-unit banknotes {{banknote-stub