Great Britain 1966 4d British birds (Ordinary) error, SG696/9ag.
A superb unmounted mint, with full original gum, block of four with bright blue (Blue tit & Black headed gull) omitted.
Offered with an example of the normal block for comparison an display purposes.
A striking and scarce Queen Elizabeth II missing-colour error, with Pierron recording only 40 mint blocks.
SG catalogue value: £1,600.
