The bank formed as a result of the need for a reduction in the number of banks of issue, which numbered 53 sometime after 1826. In the 1874 revision of the Federal Constitution it was given the task to oversee laws concerning the issuing of banknotes. In 1891, the Federal Constitution was revised again to entrust the Confederation with sole rights to issue banknotes. The Swiss National Bank was founded under the law of 6 October 1905 ('the National Bank Act'), which entered into force on 16 January 1906. Business was started on 20 June 1907.