Great Britain 1840 1d Mulready letter sheet, Stereo A18, forme 2, uprated to 2d for weight up to 1 ounce with 1d penny black, plate 1a, (SGME1, SG2).
The letter sheet was sent on May 9th, 1840 (the fourth day of issue) from London to Carlisle cancelled by two red Maltese Crosses.
This is the only uprated 1d Mulready recorded on this date known to exist.
Accompanied with an independent and clean certificate of authenticity from the Royal Philatelic Society (RPS).
An exceptional unique item of a very high quality and one for the connoisseur of early postal history.
Provenance: Ex. "Mayflower" Grand Prix Collection.
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