KALGAN: 1918 Cover sent registered to the USA with War Charity 3k and Russia Chinese surcharged 1c on 1k, 2c on 2k, 3c on 3k, 4c on 4k and 10c on 10k, all tied by Kalgan 31.5.18 cds (T&S type 5, Casey type 6), with reg’d label in English adjacent, Japan transit, twice opened and resealed by censors, Jersey City arrival, a very rare franking. Note: An exception of the Russian P.O.s in China, Kalgan was placed on the same footing as Mongolia and stocked with ordinary Russian stamps until 1917, when it fell into line with the other offices in China proper and was supplied with stamps surcharged in Chinese currency.