Antique 1861 German States Prussia Silver Coronation Thaler Coin Brooch Wilhelm I. This is an 1861 Prussia Coronation Thaler coin depicting King Wilhelm I and Queen Augusta, which has been converted into a brooch. The silver coin was issued to commemorate their coronation in 1861. It made from 900 coin silver. Weighs 0.8 oz. The obverse features the conjoined portraits of Wilhelm I, King of Prussia, and Augusta, Queen of Prussia. The coin has been set in a decorative metal frame with a pin and clasp to be worn as jewelry. See pictures for details.