cover KULDJA: 1918 (14 May) heavy money letter envelope to Tientsin bearing 20k. pair, 70k. strip of three and 3r. 50 (2) cancelled by double ring d.s., serial "a" (Type 7A) showing Harbin (T.P.O.), Changchun (I.J.P.O.) and arrival (I.J.P.O.) d.s.; one 20k. and one 3r. 50 were damaged when the envelope was opened. Rare and appealing. Photo