cover 1911 "Kitai" 20k. stationery envelope registered to Germany, 1912 "Kitai" 7k. letter card (stained) bearing additional "Kitai" 3k., 1913 Romanov 10K. letter card registered with "Kitai" 10k., unfranked 1911 postal receipt piece; all cancelled by Peking double-ring d.s.