O. 16/1 DE 05" c.d.s. (possibly a Camp of Exercise), "SILIGURI" (5/12) and "FIELD P.O. NO. 16" (6/12) (Chamba) single-ring d.s. Rare and unusual. Photo " /> cover 1905 (28 Nov.) Chamba Q.V. ½a. stationery envelope in combination with K.E. ½a. from Roorkee to Col. Bailey, Umballa and redirected to Gyantse, on reverse "F.P.O./N<V>O. 16/1 DE 05" c.d.s. (possibly a Camp of Exercise), "SILIGURI" (5/12) and "FIELD P.O. NO. 16" (6/12) (Chamba) single-ring d.s. Rare and unusual. Photo | Christie's