with the rarest being one of two known one-cent "Z" Grill stamps from 1868. If sold for its estimate of $4 to $5 million, the ultra-rare collectible would become the most valuable American postage ...

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-founded asset ...

Japan Post will issue the first new 1-yen (1 cent) postage stamp in 70 years on April 14, featuring its bear mascot character, Posukuma. The mascot’s name combines the Japanese word “kuma ...