The Vereinsthaler was the currency of Prussia between 1857 and 1873. It replaced the Thaler at par and was replaced by the Mark at a rate of 1 Vereinsthaler = 3 Mark. The Vereinsthaler was subdivided into 30 Silbergroschen, each of 12 Pfenninge.
References
Prussian vereinsthaler Wikipedia(Text) CC BY-SA