Collectors Trade Rare Stamps Worth Millions

NEW YORK - NOVEMBER 02: One of a block of four rare United States airmail error stamps, known as the Inverted Jenny plate block, worth nearly $3 million November 2, 2005 in New York City. Stamp dealer Charles Shreve, who is standing in for stamp dealer Bill Gross, swapped the block of United States airmail error stamps for a rare 1-cent Z-grill stamp. With the completion of the trade, the block's owner, bond investor Bill Gross, will own what is believed to be the first complete collection of 19th-century United States stamps ever assembled. The 1-cent Z-grill stamp is a blue stamp depicting Benjamin Franklin that was issued in 1868 and named because of an experimental security grill. (Photo by Spencer Platt/Getty Images)