Only one of the one-cent Z-grill, the rarest US stamp, is available to private collectors. When it goes up for auction in June, it could sell for millions.

America’s most valuable postage stamp sold for nearly $4.4 million on Friday. The 1868 one-cent “Z” Grill was sold as part of the collection owned by “Bond King” Bill Gross, who co ...

A rare Benjamin Franklin Z-grill stamp from 1868 could fetch as much as $5 million once it hits auction in New York. There are only two known stamps in existence.

The One-Cent Z-Grill stamp was first created in 1868 and is best known for its special grill pattern. The grill pattern was originally used to help detect stamp fraud.

A one-cent postage stamp from 1868 is expected to become the most expensive U.S. stamp ever sold when it heads to auction in June. Known as the “Z-grill,” the stamp is the most-valued piece of ...

The One-Cent "Z" Grill stamp was the crown jewel of the auction, selling for $4,366,000. Naples resident Charles Shreve was given the responsibility of selling collection after being Gross's ...

One-Cent "Z" Grill stamp sold in an auction for over $4 million. The One-Cent "Z" Grill stamp was the crown jewel of the auction, selling for $4,366,000.

A rare 1868 1-cent “Z” grill stamp. Courtesy Siegel Auctions As a child, billionaire investor Bill Gross received a set of stamps from his mother, who believed the album could pay for his ...

If the stamp sells within that range, it will smash the current record for a U.S. postage stamp, which is the $2 million bid for an “Inverted Jenny” at Siegel this past November. The Z-grill ...

One of two known One-cent "Z" Grill postage stamps is coming to market for the first time in 26 years, alongside other rarities at Siegel Auctions.

IN A multimillion-dollar swap, a California collector traded a block of four 1918 stamps bearing the image of an upside-down plane Wednesday for an equally rare 1868 one-cent stamp.