Two visitors view at Chinese philatelist Li Shuguang's collection during the 2006 World Philatelic Exhibition in Washington, capital of the United States, June 2, 2006.  (Xinhua Photo)

An military envelop posted in the 1930's of Chinese philatelist Li Shuguang's collection is displayed during the 2006 World Philatelic Exhibition in Washington, capital of the United States, June 2, 2006. (Xinhua Photo)

An envelop posted from France to Britain in 1876 is seen at the 2006 World Philatelic Exhibition in Washington, capital of the United States, June 2, 2006. (Xinhua Photo)

A woman visits the counter of China National Philatelic Corp. at the 2006 World Philatelic Exhibition in Washington, capital of the United States, June 2, 2006. (Xinhua Photo)