The inverted Sun Yat-sen stamps feature Sun Yat-sen issued in 1941, but only one sheet of fifty has inverted portraits. Nowadays only two pairs of this error are known to exist and this fact makes them so valuable in the eyes of stamp collectors. In March 2012, an inverted Dr. Sun stamp was sold for over HK$2.4 million (or roughly $305,707) at Zurich Asia, setting the world auction record for any Republic of China stamps at that time.
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