Last month one of the very few infamous inverted Jenny plate block (#Scott C3a) was sold and it set a new US philatelic record. The block sold for more than $4.8 million, becoming the second most expensive stamp in the world, just after the 1856 1¢ Magenta British Guiana who sold for $9.48 million this summer (see our article on this subject).
The sale was conducted by Mr. Sundman of Mystic Stamp and was a complete shot out of the dark. In fact he was planning to exhibit the stamp when he received an unexpected offer that he could not refuse. The phone call took place in late september and the buyer requested anonymity.
The block in question was traded to Sundman in November 2005 for a 1868 Franklin Z-Grill (Scott #85a), which there are only two known copies. It belonged to William Gross who acquired it also in 2005 for $2.97 million, on the other hand Sundman acquired the Z-Grill in 1998 for $935,000. These are big numbers my friends!