A stamp issuing ceremony of the two stamp issues "20th Anniversary of the Reunification of Macao with the Motherland" and “20th Anniversary of the People’s Liberation Army Garrison Stationed in Macao” was held at the General Post Office, Macao. People waited in line to buy the newly issued stamps. (Photos: Liang Peiyu/People's Daily)

The stamp series that celebrates the 20th anniversary of the People’s Liberation Army (PLA) stationed in Macao. Designed by Yu En, this series is to honor the PLA’s role in maintaining the stability of Macao society.

A stamp series features the People’s Liberation Army (PLA). Designed by Yu En, the series is to honor PLA’s role in maintaining the stability of Macao society.

A stamp series issued on the 20th anniversary of Macao’s return to the motherland features the Golden Lotus statue, one of the most well-known landmarks of Macao.

A stamp issuing ceremony of the two stamp issues "20th Anniversary of the Reunification of Macao with the Motherland" and “20th Anniversary of the People’s Liberation Army Garrison Stationed in Macao” was held at the General Post Office. Since 1999, a total of six sets of special stamps have been issued by the post office to celebrate Macao’s return to the motherland.

The original photos that inspired the design of the PLA stamps issued on the 20th anniversary of Macao’s return to the motherland.

A man takes a close look at the stamp issued on the 20th anniversary of Macao’s return to its motherland in the post office.

A stamp issuing ceremony of the two stamp issues "20th Anniversary of the Reunification of Macao with the Motherland" and “20th Anniversary of the People’s Liberation Army Garrison Stationed in Macao” was held at the General Post Office, Macao. Since 1999, a total of six sets of stamps honoring Macao’s return have been issued.

A stamp issuing ceremony of the two stamp issues "20th Anniversary of the Reunification of Macao with the Motherland" and “20th Anniversary of the People’s Liberation Army Garrison Stationed in Macao” was held at the General Post Office, Macao. People are seen looking around at the stamps displayed inside the post office. (Compiled by Li Bowen)