Necklace made from nine thalers from 1780, the 35th year of her reign. The Maria Theresa thaler (MTT) is named after Empress Maria Theresa, who ruled Austria, Hungary and Bohemia from 1740 to 1780 and is depicted on the coin. The MTT was originally struck in Austria between 1740 and 1780. It was the circulating currency of the Holy Roman Empire and its dominions and it was one of the most important trade coins in Europe and the world. Since the death of Maria Theresa in 1780, the coin has always been dated 1780. It has been continuously minted in various mints around the world: Birmingham, Bombay, Brussels, London, Paris, Rome, and Utrecht, in addition to the Habsburg mints in Günzburg, Hall, Karlsburg, Kremnica, Milan, Prague, and Vienna. It is estimated that until 2000, 389 million pieces were minted. As of 2019, it is still sold by the Vienna Mint.