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 ...
A New York auction house is selling what it calls “America’s Most Valuable Postage Stamp”—a 1-cent “Z-grill” stamp from 1868 featuring Benjamin Franklin—and that's hardly an ...