St Helena 1884-94 1s yellow-green, watermark CA, error SURCHARGE DOUBLE, upper marginal, SG45a.
A brilliant quality unmounted mint example with full original gum, (hinged on margin only).
This example was taken from the block in the Royal Philatelic Collection, which once housed all known examples of this error. There were only around twenty examples released on to the market in the 1970s.
A spectacular major British Commonwealth rarity.
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