If you refer to a British coin, and depending on the age of the coin and where the characters are located on the coin, it could have one of two purposes.
It may refer to the regnal year of the monarch, most likely on a silver Crown coin. XII being the twelfth year of the reign of King Bob III or Queen Susie VI for example and may appear on the edge of the coin.
Alternatively, on very much older coins, it may refer to the face value of the coin and appear on either the obverse of the reverse of the coin. XII will most likely refer to 12 Pence, making the coin a One Shilling coin. In this case, the characters are likely to be much larger than other characters on the same side of the coin.
Since no British Monarch has numbered higher than VIII yet, on a non-British coin it might refer to which monarch for a common name, for example the French King Louis XII.
No mint mark indicates that the coin was minted in Philadelphia.
An old Sixpence is an anitque coin if the mean the most valuble old coin today.
No, because old gold coins didn't contain any silver.
Jewelers and coin dealers buy gold and silver.
soldo scudo
No 1911 silver dollars were made, look at the coin again and post new question.
You should never polish a silver dollar or any old coin. Any standard silver polish you have at home will damage the coin's surface and reduce its value.
in order to tell for sure, you would need to take it to a coin specialist. most coins now are a mix of zinc and copper. if your coin truly is silver, it is probably very very old and worth a good amount of money.
Livre
If you mean 1 dollar coin, 1971 is not very old and I don't think it is silver, so probably only worth one dollar, unless it is a really perfect uncirculated coin and then maybe only 2 dollars.
I don't know what the writing means but From what I know the abyssal ruins are a place where you can find the Power Plates (Examples: Zap plate, Insect plate, and more) And If your Lucky you can find items such as ..."old crown, old gold/silver/bronze coin, old vase ,old statue, and old bracelet." These Items Are very rare and if you talk to the villa owner in Sazanami Town he will give you Money Old bronze coin: 1,000 Old Silver coin: 5,000 Old gold coin: 10,000 Old bracelet: 25,000 Old vase: 50,000 Old statue: 200,000 Old crown: 300,000
Old English Pounds (Sovereigns) were minted in 22 carat gold, not silver.