Russian post offices in China

 used the regular stamps of Russia, but in 1899, they received stamps overprinted with "KITAI" (Russian for China) in Cyrillic script. This overprint was applied to all types of stamps up to 1916, including the varieties on horizontally laid, vertically laid, and wove paper. The overprint was also applied to postal stationery envelopes, postcards, letter cards and newspaper wrappers. The overprint itself was in black, blue, or red, generally being chosen to contrast with the stamp colors. Most of these types are commonly available today (less than one US$); the most problematic is the blue overprint on the 14-kopeck wove paper variety, whose existence has been questioned.

Although the offices had always accepted Chinese currency at par, a Chinese cent being considered equivalent to a kopeck, in 1917 the overprint was changed to clarify the situation, simply consisting of the value in Chinese money and using Latin letters. The valuation was still one-to-one. A later round of overprints, in 1920, changed to use a horizontal overprint in mixed case, but these saw little use, all Russian post offices in China being closed in that year.