GB Arnold Machin Centenary Post & Go Stamp rated Worldwide 20g issued exclusively at Stampex in 2011. The stamp is mounted on the front of a Post & Go promotional postcard based upon the popular "Keep Calm" wartime information poster design.
The stamp has been cancelled by a special, one day only, "50th Year of Machin Stamps" postmark for Windsor dated 22nd March 2016.
Only a small number of these cards were produced and, of those, just a few were postmarked by Royal Mail bearing this value of Post & Go stamp.
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