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This revolutionary concept - known as attenuation - is one of the bedrocks of vaccine methodology today
Available at over 30% discount to catalogue value
A very fine used large four margin left hand marginal horizontal pair of this rare shade lightly cancelled by two Derby "242" sideways duplexes
Karl Malden
A very pretty registered transatlantic cover and interesting combination piece of postal history
Great Britain 1868 1d rose red Plate 22 imprimatur, SG43var Montserrat stamps This revolutionary concept - knownGreat Britain 1868 1d rose red Plate 22 imprimatur, SG43var. A very fine unused four margin imperforate imprimatur lettered 'AJ'. Very rare as only 21 examples have been removed from the imprimatur sheet, several of which are in institutionalised collections. Order online, by phone +44 (0)1534 639 998, or via email info@paulfrasercollectibles. com
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