The Thaler (sometimes Reichsthaler) was the currency of Prussia until 1857. From 1750, it was distinct from north German Reichsthaler unit of account in that it contained  1⁄14 of a Cologne mark of silver, rather than  1⁄12, and was minted as a coin. This change was implemented by Philipp Graumann and the system of 14 thaler to the mark was known as the Graumannscher Fuß. In 1857, the Prussian Thaler was replaced by the Vereinsthaler, having become the standard across much of Germany.