There's no simple answer. US has struck coins since 1793 in about 2 dozen denominations so there are many rare ones to choose from.
The following are among the rarest. All of them are in collections so there's no chance any will turn up in change!
1854-O $20 gold piece (double eagle)
1933 $20 gold piece
1793 Liberty head cent with a chain reverse
1913 Liberty head nickel
1794 silver dollar
1804 silver dollar
1822 $5 gold (half eagle)
1796 and 1797 half dollars
All of those (and more) are worth well into 6 or even 7 figures. If you consider coins worth less than a quarter of a million dollars there are many dozens.
nickels
Rare coins are not common. Some rare coins that well known would be a 1909 S VDB penny.
No coins in 1949 are rare, but as with all US coins, high grade Mint State examples can be valuable.
Please be more specific. Many U.S. one dollar coins are considered rare.
"E Pluribus Unun" and "In God We Trust" are some sayings that are used on US coins. US coins no longer have to say "In God We Trust" but so far they all do.
a 1920 buffalo nickel is worth about 2.50 because it's not that rare
Rare coins are not common. Some rare coins that well known would be a 1909 S VDB penny.
None of the US coins dated 1977 are rare.
2011 Lincoln cents are not rare. It just takes some time for "current year issue" coins to make their way into circulation.
That depends on which rare coin you have. Some rare coins are worth only 150 dollars in average circulated condition while others are worth thousands of dollars. To get a more specific answer include the date and denomination of your coin.
there are coin shows and coin collecting clubs. I'm sure you can also buy rare coins on the internet. Some pawn shops or jewelry stores may have some rare coins. And private dealers.
No coins in 1949 are rare, but as with all US coins, high grade Mint State examples can be valuable.
I bought most of my rare coins at auctions.
They make new ones every day so to get a good start buy a copy of Red book an add up all the mintage's That well give you some idea.
You need to be more specific, The US has made MANY silver coins of different denominations from 1794 to 2011.
We cannot see you rare coins. Since we cannot even see your rare coins, we do not even know if your coins are indeed 'rare', what they are, their condition, when they were made - we do not know anything. Please specify in a different question what your coin is, the date it was made, and the condition it is in.
No simple answer, many US silver dollars are considered rare for different reasons, be more specific and post new question.
Yes, there are rare coins from the Bahamas. One of the coins is a 1991 Bahamas gold coin where only 500 of them were made