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| This British stamp has a strange overprint. What is it? [Manuel Praest] |
| The overprint (difficult to read black on brown) is "LUTON CORPORATION". Luton is a town in the UK north of London. This is a therefore security overprint like #50 on Stefano & Casper's site. [Chris Doran] |
| The 'Luton Corporation' overprint is a security overprint by the City of Luton, in England, to prevent unauthorised usage/theft. Other public and private bodies have done the same. Another method is the 'Perfin'. [Robert Wilson] |