Great Britain 1966 4d British birds (Ordinary) error, SG696ag.
A very fine unmounted mint, with full original gum, block of four with bright blue omitted affecting Black Headed Gull (water) & Blue Tit.
Offered with an example of the normal block for comparison and presentation purposes.
A scarce Queen Elizabeth II stamp error of missing colour. Pierron records only 40 mint blocks in existence.
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