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Die - Intaglio - 1881 ½d Perkins Bacon intaglio die, being an oval area of background lathe work impressed from a roller, with added incised lines for outline of head, on steel. St. Vincent. Stone: '17th September 1881: 'Engraving Preliminary Die St. Vincent Postage Stamp Halfpenny... we have used a much lighter machine ground... which has enabled us to use a lighter ink.' '.