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Phosphor graphite imprimatur
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Author:  l2ggy [ Tue Feb 22, 2022 11:55 am ]
Post subject:  Phosphor graphite imprimatur

I am looking for information regarding imprimaturs drawn from the 1959 wilding phosphor graphite issue. Were multiple sheets drawn from the print run or only a single sheet examination and subsequently retained by the Post Office/ The Postal Museum? Thank you
Colin Davies

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