Okay, first the stamp - a marvelous error (bad enough to be good, as collectors say), a bicolor error of the type of the U.S.'s Inverted Jenny. HuffPo must have gotten caught up in error fever; or flu, in deference to the season. That's the only explanation I can imagine for calling the four anna stamp the hour anna stamp.
The final error involves the picture. Do you see that unprotected stamp in contact with naked fingers, and all the oils that they produce? What a philatelic no-no! Now, if that were a stamp worth 25 cents no one would make a stink. But come on, the stamp just sold for £69,600. This is what they invented stamp tongs for, folks.