1 oz Islamic Collection, Eid mubarak. Celestial vault and crescent moon: The inscription mentions a "vault of heaven" and a "moon crescent." Reverse: The reverse of the coin features the calligraphic greeting "Eid Mubarak." Eid Mubarak is a traditional Arabic expression used to wish someone a happy holiday, particularly during the celebrations of Eid al-Fitr and Eid al-Adha, two of Islam's major festivals. Surrounded by a traditional Islamic geometric pattern: The coin is also described as being surrounded by a traditional Islamic geometric pattern.