A staff member shows the commemorative stamps marking the 40th anniversary of China's reform and opening up at the post office of Liaoning provincial archives in Shenyang, capital of northeast China's Liaoning Province, Dec. 18, 2018. (Photos: Xinhua)

China Post released a set of commemorative stamps and one souvenir sheet marking the 40th anniversary of China's reform and opening up on Tuesday.

Chang Rongguang, an 82-year-old stamp collector, shows the first day cover with stamps released to mark the 40th anniversary of China's reform and opening up at a post office in Xicheng District of Beijing, capital of China, Dec. 18, 2018.

China Post released a set of commemorative stamps and one souvenir sheet marking the 40th anniversary of China's reform and opening up on Tuesday.