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A superb unmounted mint example of the rare Prussian Blue postage stamp
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The unique block of four - the greatest treasure of Hong Kong philately
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Very fine example of this rare colour shade
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A very rare mint example of the rare £1 brown-lilac postage stamp
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Rare sheet of 12 used for further tests for new 2d ink
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Very rare block of 12 trials used for further tests on the new 2d ink
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Very rare fugitive ink trials for the first line engraved issues
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Exceptionally rare presentation sheet of 1840 Rainbow Trial stamps in red and blue
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Rainbow trial plate of 12 - believed to be the only example in private hands
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