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".
Until 1821, the thaler was subdivided in Brandenburg into 24 Groschen, each of 12 Pfennige. In Prussia proper, it was subdivided into 3 Polish Gulden = FL = Zloty , each of 30 Groschen (each Groschen = 18 Pfennige) or 90 Schilling. Prussia's currency was unified in 1821, with the Thaler subdivided into 30 Silbergroschen, each of 12 Pfennige.
In 1857, the Prussian Thaler was replaced by the Vereinsthaler, having become the standard across much of Germany.