Maria Theresa Silver Coin (Maria Theresa Thaler 1780) – Old Austrian Taler for Coin Collectors For sale is 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 * 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.