First, it is highly unlikely your coin was struck in 1780, the Maria Theresa thaler has been struck in large quantities from 1780 all the way to the present day. If you are really interested, there are ways to determine by the die if yours is an older strike or a newer one. But generally, these coins sell for silver scrap, or perhaps a bit more. You should easily be able to sell it for $20-25 depending on the price of silver.
The value of a 1780 Maria Theresa Thaler can vary depending on its condition and any unique characteristics it may have. Generally, these coins can range in value from about $20 to several hundred dollars, with rare or well-preserved pieces commanding higher prices. It's best to consult with a numismatic expert or use a coin appraisal service to determine the specific value of your coin.
Most Maria Theresa Thalers are modern restrikes and generally trade for close to silver melt, about $20-21 at present. Don't let the date fool you, nearly all the coins were minted well after 1780 and indeed continue to this present day, still with the date of 1780.
It's not really a silver dollar. What you probably have is a Maria Theresa taler, a bullion coin that's been issued by many countries almost continuously for over 2 centuries. All of them are dated 1780 regardless of when they were actually minted. Unless it's an original coin (very unlikely) its value is roughly the same as the current price of 1 oz. of silver. Silver prices change daily so it's best to look at a precious-metals site or the financial pages of a newspaper for current values.
Anna Maria Porter was born in 1780.
The value of a Theresia silver coin can vary depending on its condition, rarity, and current market demand. It is recommended to have the coin appraised by a professional numismatist or check online auctions or coin dealers for current pricing information.
More than 800 Million have been struck to date, all dated 1780 The thaler became the unofficial currency in some areas of Africa and Asia, and is still in use today as a "trade silver dollar" in many Arabian bazaars.
Maria Theresia of Tuscany died on an unknown date in 1780.
José Maria de Zalvidea was born in 1780.
Maria Theresa
Maria Theresa
Duchess Maria Antonia of Bavaria died on 1780-04-23.
$18 is the value of a 1780 x countermark coin 20 piastres.