Simple answer: All coins are graded by the same scale. Circulated coins by how much wear the coin has. Uncirculated coins by how well the coins are struck.
racism
sliver dollar
US coins are usually graded on the Sheldon scale. The Sheldon scale grades coins from 1-70. A coin graded 1 is very, very, poor and is basically only identifyable by the size of the coin. A coin graded 70 is perfect with no defects at all. Most coins grade somewhere in between the two extremes.
SIMPLE ANSWER: Circulated coins are graded by how much wear the coin shows. Mint State coins are graded by how well the coin is stuck.
The best place would be at a local coin shop and some jewelry stores will give you prices for coins. However, keep in mind that most circulated coins are only worth their silver content which is about $22 at the moment, while some rare dates may be worth more, unless your coins are graded or in exceptional condition, most will pay simply melt price for your dollars.
Because they were all struck at the Philadelphia mint
Coins are graded by experts, who look at how much wear is on the coin, and whether is was properly struck when it was made.
Coins that are in brilliant uncirculated condition are almost perfect. Take them to a coin collector to have them graded for free.
It means, Double Die Reverse
Morgan dollars are graded just like any other coin. Circulated examples are graded by how much wear the coins have. The grades for Mint State coins are determined by how well the coins are struck, mint luster, number an location of contact marks.
Silver coins can be purchased from a number of places in the US. You can purchase silver coins directly from the United States Mint, and most cities contain many stores for buying and selling silver and gold coins.
Assuming the coin is circulated, the 1840 Seated Liberty dollar is the first year issue for this series of sliver dollars. For an accurate assessment of value the coin needs to be seen and graded. In general, retail values for low grade coins are $260.00-$375.00, better grade are $450.00-$800.00 and coins showing almost no wear run from $1,000.00-$2,400.00. Values are a market average and only for coins in collectible condition, coins that are bent, corroded, scratched, used as jewelery or have been cleaned have far less value if any to a collector or dealer.