Catalog Value without the Official Perforations is $17.00.

Between 1915 and 1945 overprints were applied to the 1st and 2nd Sinkiang Overprints on 1stPeking Junks and the 3rd Overprint on the 2nd Peking Junks. These were consigned to the frontier province of Sinkiang in order to limit their use only to that province. The purpose was to prevent speculation in stamps due to the inferior currency of Sinkiang, which was worth only up to about a third of the national currency. The Sinkiang post office operated at a deficit , which was made good by the provincial government. In return , the post office perforated certain issue s of the overprinted stamps for free use by the government on official correspondence. The perforation, in Chinese characters reading downward from the right, is "kung wen t 'iehyung," which means "official papers sticker use." The Sinkiang Per fin is known in eight different  positions.  Various missing- pin varieties exist, some with so many pins missing as to make the characters illegible. The challenge is to locate each official perfin on each of the perfined issues of the Skinkiang Junks in all 8 positions and errors. Dollar Values are very hard to find. Covers are rare. According to Chiu, the use of the Sinkiang perfins began in 1915 and continued to January 16, 1943.