Discover events in American history – plus the stamps that make them come alive.
Today’s Article
-
May 17, 2026
Butterfly Series
On May 17, 2010, the USPS issued the first stamp in the Butterfly Series. The stamps were created for use on envelopes that couldn’t be sorted on the USPS’s automated equipment, otherwise known as “nonmachinable.” They’re often used for greeting cards.
