Unused 20th Century US Stamps

The breadth of U.S. postage stamps issued during the 20th century is staggering, from denominational postage bearing formal presidential portraits to stamps that celebrate everything from national parks to space exploration. In general, unused stamps are more expensive to collect than used stamps, which makes condition an important determinant of a stamp’s price. One of the most collected series was issued early in the century, on May 1,...Continue Reading