GB 1977 SG1029a Mint - imperforate cylinder block
Stock Code: P189009037
1977 8½p Chemistry. Superb unmounted o.g. corner marginal block of six showing cylinders "2A.,1B.,1C.,1D.,2E.,1F.,1G.", the lower pair completely imperforate and the top two pairs partially perforated. Pierron records only 4 imperforate pairs, this being the unique cylinder block.
£6,000.00
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