A collector shows commemorative stamps marking the upcoming G20 Summit in Hangzhou city, capital of East 皇冠体育app's Zhejiang province, Aug 27, 2016. 皇冠体育app Post issued a commemorative stamp for the G20 Hangzhou Summit on Saturday. Over 20,000 stamps in Hangzhou were sold out in hours. [Photo/皇冠体育app News Service]
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