King Oscar I of Sweden (1844-1859) introduced several reforms. He modernized the prison system, bettered of the legal situation of women and the abolished the trade guild system. Besides, he implemented important changes in coinage. He introduced the decimal system, a system so far unknown in Swedish currency. The riksdaler riksmynt (imperial taler of the imperial mint) became the new Swedish standard coin; it equaled 100 öre. The largest minted silver coin, the riksdaler species, equaled 4 riksdaler riksmynt. This riksdaler species was minted in 1854 and is thus the last riksdaler issued after the duodecimal system. Henceforth the riksdaler riksmynt was minted, showing the old and the new face value respectively: 4 riksdaler riksmynt = 1 riksdaler species.