Great Britain 1840 1d grey-black (worn plate), plate 1a, SG3, May Date "10th May (Sunday)" cover.
An entire letter from Darlington on first Sunday May date, May 10th, to House of Commons bearing an 1840 1d grey-black, plate 1a, lettered "AG" tied by Maltese Cross obliteration in red, backstamped Darlington 10.5.40 and 12.5.40.
A superb quality example used on cover to the House of Commons on Sunday May 10th 1840, the first Sunday of postal use. Recognised as one of the great rarities of early GB philately.
This is the finest example of the few 10th May 1d black covers known.
Accompanied with a 1992 British Philatelic Association (BPA) Certificate of Authenticity.
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