How many stickers do you know?

In 1840, the world's first postage stamp was introduced. At that time, these early stamps had no perforations and no adhesive on the back, which made them inconvenient to use. Later, a special glue was applied to the back of the stamps, allowing users to simply wet the back with water and stick them onto their mail. During the 1960s and 1970s, countries like Sierra Leone and Tonga were among the first to introduce self-adhesive stamps, also known as "stickers" or "wet-back" stamps. These allowed users to affix them without needing water. Today, over 70 countries and regions produce stamps using this self-adhesive technology. China started producing its own self-adhesive stamps in 2004. On September 30, 2004, China issued a special stamp featuring the National Flag and Emblem of the People's Republic of China, along with a small version of a perforated stamp (with a limited print run of 700,000). It also released a small version of the "Chinese People's Republic National Emblem (Self-Adhesive)" stamp, with a print run of 500,000 copies. This marked the beginning of Chinaâ€™s self-adhesive stamp collection. In June 2005, China issued the "Hans Christian Andersen Fairy Tales (Adhesive)" mini-sheet, with a circulation of 2.65 million copies. In November 2005, the "29th Olympic Games - Emblem and Mascot (Adhesive)" mini-sheet was released, with 5.5 million copies printed. Other notable issues include the "Dog (Adhesive)" stamp in March 2006, the "29th Olympic Games - Sports (A)" in August 2006, and the "29th Olympic Games - Sports (B)" in August 2007, all with significant print runs. China continued its Olympic-themed series with the "29th Olympic Games - Competition Venue (Self-Adhesive)" in December 2007, and the "29th Olympic Games - Torch Relay (Adhesive)" in March 2008. The "Olympic Games from Beijing to London (Stickers)" was released on August 24, 2008, with 1.9 million copies. In addition to Olympic themes, China also issued several small bills. For example, the "Guo Rongrang Pear (Adhesive)" was released on June 1, 2007, with a print run of 5.99 million. The "Cao Chong Xiang Xiang (Self-Adhesive)" followed in 2008, with 6.7975 million copies, and the "Blessings for the Fatherland (Adhesive)" in 2009, with 6,592,200 copies. In summary, self-adhesive stamps can be broadly categorized into two forms: small versions and small sheets. They also cover two main topics: major political and economic events, as well as cultural and children's themes. From a collecting perspective, stamps with a circulation of more than 2 million may not yet show strong appreciation. However, small self-adhesive stamps with lower print runs, especially those with only 500,000 copies like the "People's Republic of China National Emblem (Resin)" issue, are worth acquiring and holding long-term.

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