The stamps of the 70th anniversary of the establishment of diplomatic relations between China and Indonesia are very valuable. On the 70th anniversary of the founding of People's Republic of China (PRC) (1949-20 19), China issued 5,000 sets of banknotes, coins and stamps (8 banknotes, 20 coins and 48 stamps) with a retail price of 2,880 yuan. Stamp is a kind of postal printing certificate for mailing and delivering mail, which is issued by sovereign countries. The square space of stamps often reflects the history, science and technology, economy, culture, customs and natural features of a country or region, which makes stamps have collection value in addition to postal value. Stamps are also an important source of financial resources in some countries or regions.