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BRITISH INDIAN OCEAN TERRITORY - 2012 IMPERF PROOF SHEETLETS QEII Diamond Jubilee set, as SG 473/8, IMPERF SHEETLETS of 8 proofs on unwatermarked, gummed paper from the B.D.T. Printers Archive, superb, never hinged mint. Rarely seen or offered. (6 imperf sheetlets of 8 proofs = 48 Proofs)