Stamps printed upside down keep emerging from Cherrstone, particularly those printed in mainland China decades ago. One 1941 depiction of Sun Yat Sen is expected to sell in the neighborhood of $200,00 at the December New York auction. It’s thought only one sheet of 50 got out of the post office before the error was spotted. A 1923 Peking stamp with the 2-cent postage inverted, one of only 13 known to exist, is estimated at $150,000.
Cherrystone reports the 1923 stamp surcharged in red on first Peking printing and considered one of the “Four Treasures of the Republic,” was discovered by a medical officer aboard a French gunboat calling at the small port of Wanshsien in 1924 who knew immediately what a rarity he had found and handled them accordingly.