ABOUT USPS EID STAMP
Eid here means Eid-e Ghorboon and Eid-e Fetr and definitely not Norouz.
http://www.usps.gov/images/stamps/2001/23.htm
Eid in the above stamp definitely does not mean Norouz. Why? Here is the reason:
http://www.usps.gov/images/stamps/2001/
In the above document, Eid is defined as:
[This stamp in the Holiday Celebrations series commemorates the two most
important festivals-or eids-in the Islamic calendar. Eid al-Adha (celebrated on
March 6 in 2001) marks the end of the hajj, the annual period designated for
Muslims to make their pilgrimage to Mecca. Eid al-Fitr (celebrated on Dec. 16 in
2001) celebrates the end of the Ramadan fast. Designed by calligrapher Mohamed
Zakariya, the Eid stamp features the Arabic phrase "Eid mubarak" in gold against
a blue background, which is reminiscent of many great works of Islamic
calligraphy. Eid mubarak translates as "blessed festival," and can be
paraphrased, "May your religious holiday be blessed."]