British New Guinea Papua 2½d, 2/6d Lakatoi SG 11a, 16a unique watermark variety

2d black and Violet plus 2s6d black and brown both on thin paper with comb perforation. Each shows cross in watermark variety from centre of the printers sheet which only occurs once in 6 or 9 sheets in certain printings. 2d has minor faults, 2/6 only 764 sold, few of which were used and very likely to be unique with this variety.
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