This gorgeous coin pendant has a silver fineness of 833,3. The coin and pendant weigh combined 49.49grams. The Maria Theresa thaler (MTT) is a silver bullion coin and a type of Conventionsthaler that has been used in world trade continuously since it was first minted in 1741. It is named after Empress Maria Theresa, who ruled Austria, Hungary, and Bohemia from 1740 to 1780 and is depicted on the coin. Since the death of Maria Theresa in 1780, the coin has always been dated 1780. On 19 September 1857, Emperor Francis Joseph of Austria declared the Maria Theresa thaler to be an official trade coinage. A little over a year later, on 31 October 1858, it lost its status as currency in Austria.