Regular minting of coinage began in Hungary in the 1020s. These coins continue an existing national practice of minting of silver and gold commemorative coins. The coins are minted by the Korea Minting and Security Printing Corporation (KOMSCO). The minting of coins was privatised. In 1806 President Jefferson suspended the minting of silver coins. The privilege of minting official coins developed into the concept of seigniorage. He ordered minting of coins from base metals with face value of precious metals. The Yamato government began minting coins in 708 AD. Future minting of such coins has been reserved solely for collectors. The influx of silver into Europe led to the sometimes uncontrolled minting of coins. Mint-made errors are errors in a coin made by the mint during the minting process. By 300 AD, Aksum was minting its own coins in silver and gold. Samana which was famous for minting coins, with this treasury the Sikhs became financially stable. A problem has arisen in differentiation of coins made using similar blanks and minting techniques. For approximately 500 years, Kilwa was minting coins.