If the 'gold' disc is Iranian, it might be a token.
The bill has the number 20,000 in the upper left (backward '7' followed by four 'diamonds') The official currency of Iran is the Rial (Farsi: ريال). The 10,000 Rial bill is sometimes known as a "Khomeini" because the picture of the departed Imam (i.e., Khomeini) is imprinted on its obverse. 10,000 Iranian Rials are equal to roughly one U.S. dollar. Your 20,000 Rials bill was originally worth $2; perhaps, still today.
Don...