cover 1878 (Nov.) envelope (separated in two and other faults) "Via Brindisi" to London, bearing 6a. with a fair though identifiable strike of the "CAMP OF EXERCISE DELHI/FIELD P.O." barred duplex, believed to have been used as an emergency cancellor at the start of the 2nd. Afghan War campaign. Photo
cover 1878 (Nov.) envelope (separated in two and other faults) "Via Brindisi" to London, bearing 6a. with a fair though identifiable strike of the "CAMP OF EXERCISE DELHI/FIELD P.O." barred duplex, believed to have been used as an emergency cancellor at the start of the 2nd. Afghan War campaign. Photo

Details
cover 1878 (Nov.) envelope (separated in two and other faults) "Via Brindisi" to London, bearing 6a. with a fair though identifiable strike of the "CAMP OF EXERCISE DELHI/FIELD P.O." barred duplex, believed to have been used as an emergency cancellor at the start of the 2nd. Afghan War campaign. Photo
Further details
Note: The cover is accompanied by a long and interesting explanatory article by Gerald Sattin