1872-73 6d. pale chestnut, abnormal plate 12, OA on mourning cover to Bombay via "Brindisi" and cancelled by Bath "53" duplex dated 1873 (20 June), the reverse with London (20.6), Sea Post Office (27.6) and Poona arrival (3.7) plus an offset of the despatch duplex. One stamp is missing from the cover to make up the 9d. rate
Die proof printed in deep brown on white glazed card cut down to 38x38mm
Panes
Wing margin stamps come from the center part of the sheet. In the pane shown above the left column of stamps have wing margins, There is no such thing as a straight edge perforated stamp in GB stamps.