cover 1d. pale blue on blue, Plate 3 [34], the "cracked plate" variety, tiny surface nick otherwise very fine on "On Her Majesty's Service" blue XU5 (central filing crease) to "Officer Commanding, 87th Field (Howitzer) Battery, R.F.A.", cancelled by oval "87TH BATTERY/ROYAL FIELD ARTILLERY" d.s. (6.7.) in violet. An exquisite cover, used by the military after the Siege. Photo in colour