Great Britain 1974 3½p Christmas error, SG966a.
Superb unmounted mint with full original gum vertical strip of three with light stone (background shading) completely omitted from the top stamp and partially omitted from the middle stamp.
A great rarity and quintessential Queen Elizabeth II error with only three examples recorded.
No longer listed in the Stanley Gibbons catalogue, due to their change in policy regarding not listing prices of stamps of the most extreme rarity, but was previously listed at a value of £45,000.
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