could be a record-setting postage stamp sale. Sixteen years ago, it sold for $1.1 million, a record then. "Now we're estimating that it will fetch $2½ to $3½ million dollars," Trepel said.

WASHINGTON, March 22, 2018 /PRNewswire-USNewswire/ -- The United States Postal Service will honor the beginning of airmail service by dedicating two United States Air Mail Forever stamps this year ...

History, intrigue and a misprint combine so that a single stamp has sold for $2 million at auction. What is it? Well, at the basic level, it is a U.S. postage stamp from 1918.