Austria, Trade Coinage - Thaler, 1780 SF (Restrike). 28.0668 g, 0.8330 Silver, .7517 Oz. ASW., 41mm. The silver thaler portraying the Empress Maria Theresa, with the date frozen 1780 (the year of her death), was struck at Vienna until 1937, after 1956 to satisfy demand from the Arab countries. It has been estimated more than 800 millions coins have been struck.