A pair of rare stamps bearing a picture of Chinese nationalist leader Sun Yat-sen have sold for more than $US700,000 at auction in Hong Kong.
Auction house Zurich Asia said the 1941 blue and black stamps were purchased by an anonymous phone bidder.
They are rare because the picture was accidentally inverted.
The ABC reports the stamps came from an original sheet of 50 stamps that had the error.
Dr Sun Yat-sen (1866 - 1925) was President of China after the overthrow of the Qing dynasty in 1912. He was succeeded by Chiang Kai-shek (1887 - 1975).
