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Supposedly, there are nine Plate 77's in existence (could be more if there truly are nine).
Assuming they are all genuine, it is generally assumed that they all came from one or more test sheets that were supposed to be destroyed but was somehow mistakenly sold to the the public. So yeah, technically if even one is genuine, there may be more out there.
Of the nine, four are mint and five are used. Two of the mint stamps are "lost" somewhere. Technically, there is a 10th stamp (mint) that was destroyed in the San Francisco earthquake of 1906.
A couple of years ago, there was much buzz about a "discovered" strip of 3 on cover that initially received a certificate from an established British expertizing group despite a lot of protests/challenges from others (the finder of the cover is a well-known forger!). I never followed up on subsequent news, but assumed from lack of continued fan-fare that perhaps the cover has since then been discredited. I think I lost my download of the cover when my laptop crashed 2 years ago.
If anyone wants to continue the discussion of Plate 77, I would suggest opening a new thread, since it is a different stamp from the OP.