1904 10k dark blue, vertically laid paper overprinted KITAI in red, block of four, lightly hinged and post office fresh, v.f., each stamp signed Mikulski, with his 1991 certificate. A rarity from the Russian Offices in China, only four blocks of four known to exist (Cat No. 11) (Image)

Est.$20,000

1906 (28 Dec) registered cover from Shanghai to Berlin, franked on back with a block of 4x10k "Kitai" overprinted in red, tied by cds, with arrival pmk alongside, red wax seal removed, handstamped "Shanghai" registration strike, with Cyrillic label, fine (Image)

Est.$250