Ceylon 1918 1c on 5c purple (without 'WAR STAMP'), variety watermark inverted and reversed, upper marginal block of 4 with part centre guide, SG337by.
A very fine unmounted mint positional block of four with full original gum.
A very scarce and desirable block, with the variety visible in the margin from the face.
Accompanied with a British Philatelic Association (BPA) certificate of authenticity (2011).
Stanley Gibbons catalogue value: £640++.
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