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If genuine this could be an extremely rare, high value stamp. It looks like an imperf SG12 in superb condition lightly hinged with clean, clear gum.
Gibbons lists an imperf pair of this stamp at 5,000 pounds. This is obviously only a single, but it does not look like a trimmed perforated marginal copy to me.
This stamp was found in an old collection, but I cannot guarantee its authenticity, so will accept what the market judges its value to be.
