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Naive question: Wouldn't the first stamp sold and sent from a post office be "A-A" not "H-I"?
No one knows how the first stamp was cut from that sheet. There are four corners, and few people will cut from the top down: these were big sheets. 'TL' or 'TA' that would be closest to the clerk and easy to separate may be very good candidates. If the first buyer bought a block, anyone's would be the best guess.
As revcollector wrote, it is the
earliest known cover. I am not quite sure anyone can confirm it was the first cover for several reasons.
The first stamps were distributed to post offices on 1 May 1840. The stamps were not to be sold until 6 May 1840, as was the Twopence Blue. The latter, however, was only delivered to few London post offices by that day. The stamps were not valid before 6 May 1840.
A few postmasters may not, correctly, have read the circular instructing them (or failed to instruct their clerks). The stamps were sold and used before 6 May. The earliest known use is 2 May. There may be a cover in someone's attic with a date stamp for 1 May 1840. It has never surfaced, and probably won't. Two stamps used on 2 May are known on cover and one on piece. This appears to be one of the two covers.
Since the stamps should be cancelled by a Maltese Cross stamp that does not show the date, the only way to ascertain the date of use is by the date stamp elsewhere on the piece. Alternatively, an incorrect cancel with date may have been used as is the case with the item being auctioned.
Put in another way: there may be a few stamps around used on 1 May. But as a single, the odds are they cannot be dated. Even the stamp on the cover that is being auctioned would not be datable off cover.
The 'earliest' Penny Black, therefore, will be the earliest known use on piece.
As for what is considered the first Penny Black:
https://www.theguardian.com/artandd...ion-sothebyshttps://goscf.com/t/78901This failed to sell.