The coins were manufactured in Australia and come in a box with a certificate of authenticity. This collectible item celebrates the Summer Olympics that took place in Sydney in the 2000s, making it a special piece of Olympic memorabilia and sports memorabilia for enthusiasts of the games. Please see the photo’s for reference they are part of the description. Thank you for looking. See my other listing. Only 15 COA one is missing, which reflects the price.