Great Britain 1991 24p Bicentenary of Ordnance Survey, SG1578ea.

Great Britain Queen Elizabeth II 1991 24p Bicentenary of Ordnance Survey, Maps of Hamstreet, Kent, SG1578ea. Superb unmounted original gum left hand marginal example with black (Litho) printing treble & magenta printing double. Offered with normal for comparison. 

A very scarce error. Pierron records only 10-20 mint examples.

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