Stamp No. Original printD25.1 Dr. Sun 1st LondonD25.2 Martyrs PeipingD25.3 Dr. Sun 1st London　　The domestic postal rate for ordinary letters was raised from 4￠ to 5￠ per unit in 1937. The 4￠stamps then in stock were more than required. As they were of same green color as the 5￠, the two stamps were apt to be confused at the sale windows. Therefore, a part of the 4￠stamps were surcharged as 1￠ to be used in combination with the remaining stock of 4￠stamps(not surcharged). The 25￠and 40￠stamps, not in great demand, were surcharged as 10￠and 8￠respectively. The surcharge work was done by the Peiping Printing Bureau of the Ministry of Finance.　　Stamps of these three denominations were surcharged in No.4 Regular-Writing characters on the two vertical sides in the middle and with Arabic figures at the bottom in red or black.　　The 1￠stamps were placed on sale in March 1937 and the 8￠and 10￠stamps in July 1938.