It is not just a normal postcard, but a rare 'Harry Potter' prequel handwritten that has been stolen and so, its author JK Rowling doesn't want you to buy it.
In 2008, Rowling wrote an 800-word manuscript, on two sides of an A5 postcard, for a charity auction, which has been stolen during a burglary in central England between April 13 and 24.
The distressed author took to Twitter and requested Harry Potter fans, "PLEASE DON'T BUY THIS IF YOU'RE OFFERED IT. Originally auctioned for @englishpen, the owner supported writers' freedoms by bidding for it."
The 800-word story was sold for 25,000 British Pound and the proceeds of the auction were donated to an organization English PEN, which champions freedom of expression.
The untitled prequel features the characters Sirius Black and Harry's father James.
More than 450 million copies of the seven original 'Harry Potter' books have been sold worldwide in 79 languages.