"The Maria Theresa thaler (MTT) is a silver bullion-coin that has been used in world trade continuously since it was first minted in 1741. It was named after Empress Maria Theresa, who ruled Austria, Hungary, and Bohemia from 1740 to 1780.

...The thaler is 39.5 mm in diameter and 2.5mm thick, weighs 28.0668 grams and contains 23.3890 grams (0.752 troy ounces) of fine silver. It has a millesimal fineness of .833.

The inscription on the obverse of this coin is in Latin: "M. THERESIA D. G. R. IMP. HU. BO. REG." The Reverse reads "ARCHID. AVST. DUX BURG. CO. TYR. 1780 X". It is an abbreviation of "Maria Theresia, Dei Gratia Romanorum Imperatrix, Hungariae Bohemiaeque Regina, Archidux Austriae, Dux Burgundiae, Comes Tyrolis. 1780 X", which means, "Maria Theresa, by the grace of God, Empress of the Romans, Queen of Hungary and Bohemia, Archduchess of Austria, Duchess of Burgundy, Countess of Tyrol. 1780". The "X" is actually a saltire, and was added after 1750 denoting Maria Theresa's reign over the Austrian Netherlands. Around the rim of the coin is the motto of her reign: "Justitia et Clementia", meaning "Justice and Clemency"." Wikipedia

Please note that I am not a coin collector, nor do I profess to have any knowledge about the coins that I have listed on Bidorbuy. I am merely trying to sell some items that I inherited in order to further fund my Tertiary education.