North Vietnam – Wildlife Preservation – Orangutan – 10 Dong – 1987 – Br. Uncirculated – KM-28 – This 10 Dong business strike is listed in the Krause Standard Catalog of World Coins as KM-28 with a miniscule mintage of 22,000 coins and a market value of $30 in Brilliant Uncirculated. The coin also bears the privy mark of the World Wildlife Fund.