CEYLON 1918 1c on 5c purple (without 'WAR STAMP') variety, SG337by600. 00 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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