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Only 50 pairs originally existed and very scarce unmounted mint
including plate numbers '8' at NW and SE corners
Very scarce in this form
A brilliant mint positional block with original gum
Great Britain 1962 3d National Productivity Year error, SG632a Memorabilia Only 50 pairs originally existedGreat Britain 1962 3d National Productivity Year error, SG632a. A very fine unmounted mint, with full original gum, right hand marginal example with light blue (Queen's portrait) omitted. Missing colour also affects the arrows over the map of the UK and 'N' of 'NPY'. Offered with an example of the normal stamp for the purposes of comparison and presentation. A lovely example of this extremely visual and desirable printing error. Very scarce. Pierron