"Fort Malbro'" (Bencoolen, a settlement on the west coast of Sumatra), showing, on reverse, fine double-ring "CALCUTTA/18/GENERAL POST OFFICE" (HG SD8); an unusual destination

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"Fort Malbro'" (Bencoolen, a settlement on the west coast of Sumatra), showing, on reverse, fine double-ring "CALCUTTA/18/GENERAL POST OFFICE" (HG SD8); an unusual destination