Republic of China Inverts Set New World Record
They are rare because the picture was accidentally inverted. The stamps came from an original sheet of 50 stamps that had the error.
Zurich Asia says the price has set a new "world record for any Republic of China stamp", referring to the period of 1912 to 1949 in China, after the last imperial dynasty lost power and before the communists took over.
To learn more, click here.