Russian Post in China. Tientsin. 1918. Prisoner of war printed envelope sent insured for 3000 Rubles to POW in Ygsa (Siberia). Franked on the reverse with 2×1c/1 k. orange 5c/5 k. brown, 35c./35 k. lilac/green and pair 1 DOLLAR/1 r. brown/red. Canc. 13.2.18, russian canc. CHANGCHUN I.J.P.O. 6.3.18 and arr.mark 31.3.18. Closed with beautiful wax seals. Very high franking on rare insured cover. Exhibition item [ ✉ ]