British Guiana 1940-55 2c black Postage Dues, chalk-surfaced paper, right marginal block of 9 (3x3) showing watermark error W9a 'Missing crown' on centre stamp of middle row, SGD2a/ab.
A stunning positional unmounted mint block of 9 with full original gum.
An extremely scarce philatelic piece of the highest quality.
Stanley Gibbons catalogue value: £465+.
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