Siege of Prague by the Prussians; emergency coin of Maria Theresia; German Empress; Obverse: bust of woman with diadem to the right within the inscription. Reverse: crowned double-headed eagle with coat of arms for chest; below: value indication in cartouche within a circle; Prague; Maria Theresia (Roman-German Empress); anonymous; Praag; 1757; tin (metal); striking (metalworking); d 1.7 cm x w 0.96 gr