There are a lot of misunderstandings about this coin !
It has nothing to do with Mother Teresa - of course, it is : Maria Theresia, Empress of Austria.
The problem with this coin is, that there are about 800.000.000 coins struck in the 20th century, but with the original date 1780 !
Value : only 20 dollars...
There is no such coin.
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The value of a burg.co.tyr.1780-x coin can vary significantly depending on its condition, rarity, and demand among collectors. It is recommended to consult a numismatic expert or use online resources such as coin pricing guides or auction websites to determine its specific value.
$18 is the value of a 1780 x countermark coin 20 piastres.
Wish I had logged in for the other coin questions. You like eceryone else need to describe the coin much better. In your case it is at least somewhat understandable but if you got as far as knowing it was Maria Theresa why not tell us the origin. The coin was produced in several countries in several provincial mints. It could be worth as little as $5 and as much as $200,000. You need a pro and in reality maybe 2 if the first one says it is worth something
The first US quarter was made in 1796, look at the coin and post new question.
The Maria Theresa thaler coin was first minted in 1741 but after 1780, has since been dated to 1780. The coin was once accepted as a form of global currency, but is today seen as a collectors' item instead.
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The value of a 1780 archid avst dux coin can vary depending on its condition and rarity. Generally, these coins can range in value from a few hundred dollars to a few thousand dollars. It's best to have the coin evaluated by a professional numismatist to get an accurate assessment.
The value of a 1780 John Hancock coin, specifically the Continental Congress coin featuring his signature, can vary significantly based on its condition, rarity, and market demand. Generally, these coins can range from a few hundred to several thousand dollars. For a precise valuation, it's advisable to consult a reputable coin dealer or auction house specializing in historical currency.
It's worth around $30 usd. These coins were made till recently with the date 1780 on it. Good luck!
MUCH more information is needed. Please post new, separate questions - one for each date - with the coin's denomination and a short description of the image on it. Note that words like "liberty" or "United States" don't help to ID the coin though.