Stamp Series

Peace Day

International Day of Peace

In 2002, twenty years after it was first established, the International Day of Peace was celebrated on its new permanent date – September 21. Also known as World Peace Day, it’s a United Nations-sanctioned holiday calling for peace and an end to war and violence.

Butterfly series

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.