Milestones

TRADED. FOUR "INVERTED JENNY" STAMPS FOR ONE "Z-GRILL", completing what is believed to be the world's only set of all stamps issued by the U.S. government during the 19th century; by American bond-fund manager Bill Gross; in New York City. Gross gave the four 24 stamps from 1918, which feature an erroneously printed upside-down biplane, to Mystic Stamp Company president Donald Sundman for the 1 Z-grill from 1868 to complete the collection he has been building for over a decade. The cashless deal effectively values the Z-grill, featuring Benjamin Franklin, at $2.97 million, the price Gross paid last month for the...