Maria Theresa Silver Coin (Maria Theresa Thaler 1780) – An old Austrian thaler for coin collectors. For sale: The famous Maria Theresa Thaler coin, one of the most famous historical silver coins used in global trade and the Middle East for many years. : * Visible Date: 1780 * Country: Austrian Empire * Weight: 27 grams * Diameter: Approximately 40–41 mm Metal*: Approximately 83.5% silver * The edge is engraved with the phrase: CLEMENTIA ET IUSTITIA * It bears the image of Empress Maria Theresa on the front, and the double-headed imperial eagle on the back.