1986 Blue Pansy Butterfly 20s on 4. Full upper left corner Sheet marginal block of six, MAJOR ERROR 'Surcharge Omitted' The variety was caused by a pre-printing paper fold and the variety being contained within the top left stamp, the lower adjoining stamp showing just a tiny trace of the surcharge. The 'missing' sucharges can be seen on the gummed-side of the piece. Post Office fresh Unmounted Mint. A unique and most wonderful major variety. [US13] (Start Price = £66.40) (Image)

1990-91 16s on 12s, SURCHARGE INVERTED, vertical pair, gum bends, fresh u.m. [US4] (Start Price = £12.00)