Stamp No. Surcharged value Issue dateD21.1 1¢ 1935D21.2 1¢ 3. 1930D21.3 1¢ 1932D21.4 1¢ 1933D21.5 3¢ 1925D21.6 5¢ 1936D21.7 5¢ 1936 Prior to the raising of the ordinary letter postage from 3¢ to 4¢ effective from November 1, 1922, a big quantity of 4¢ stamps were specially printed beforehand to meet the public requirements. With the reversion of the postage to the old rate from January 1, 1923, the 4¢ stamps were kept unused. As the 3¢ stamp stock gradually ran short, the 4¢ stamps were surcharged as 3¢. The surcharge on Junk stamps invariably was made in No. 5 Sung characters and Arabic figures by the Printing Bureau of the Ministry of Finance, Peking by metal plates either in red or black characters.