نظام الزراعة
The Surabaya mint, closed in 1828, was reopened as a consequence of the high demand for coinage created by the Cultivation System. Duit and double duit coins, which had, on the initiative of the mint, the decimal denominations 1 C (cent) and 2 C, were minted 1833–1841; in total around one billion 1 cent and half a billion 2-cent coins were minted, which, alongside the minting of 1790-dated 'Utrecht' VOC duits (which were minted locally, as the VOC duits were popular with the population, using imported dies of the 18th century design but with different mintmarks) in 1827, 1834, 1835, 1840, 1841, 1842 and 1843. The only ever VOC double duits, also dated 1790, were minted 1840–1843. With demand finally satiated, in 1843 the Batavia and Surabaya mints were closed permanently, and all subsequent Indies coinage was imported.