What is the most valuable single stamp in China now?

At present, the most valuable single stamp in China is round fine print.

Original red stamp ticket 100. In order to facilitate stamping, the whole piece was cut into a cross and divided into four small pieces, each with 25 pieces. So the stamping die is 5 pieces straight and 5 pieces horizontal. Initially stamped at 1 circle. In the printing plate, the word "Dangyiyuan" is equivalent to the No.5 word, and two whole pieces have been tried, counting 50 pieces. When submitted for trial, the postal authorities stopped stamping on the grounds that the Chinese font "Dangyiyuan" was too small and inconspicuous, which might be inconvenient to use. Later, the big characters continued to be stamped, and the rest of the characters remained unchanged. Instead, the big characters were "when a circle", so the small characters were called red stamps and the small characters were a circle. It has been found that there are only over 30 pieces in the world.

The temporary stamp "Red Stamp" is one of the stamps with revision value issued by the State Post in Qing Dynasty with 1897, and it is also the first set of stamps with other stamps in China. Due to the special printing background and a small number of publications, Xiaoyuanhong printing is recognized as "the king of China Post" by the industry.