China 999A

     The stamp was quickly withdrawn from circulation because Taiwan, which is claimed by the People's Republic of China, was colored white instead of red, which contradicted the motto on the stamp, "The Entire Nation is Red." The official explanation is that "An editor from China Atlas Press found out that the map on the stamps was inaccurate because the Xisha and Nansha archipelagos were absent." The sale of the stamp was stopped after less than a day. It was not reissued.

https://driwancybermuseum.wordpress.com/2012/09/13/the-story-behind-the-rare-unissued-china-mao-stamps-1968/