Such a broad all encompassing question is not possible to answer in this forum. There are books of hundreds and even thousands of pages devoted to this subject, even for the coins of just one country.
You could venture off to your local library and look for a coin catalogue such as the "Standard Catalogue of World Coins" which will give you some idea of valuable coins in the past 100 years.
Mostly us coin worth a lot here coins below 1957 are worth at least 10 to 30 times the face value unless the coin has errors or is uncirculated.
MoreThere's simply no way to tell what a collection is worth without knowing details about each coin in it. Specifically, for each one you need to know:If your collection is from the US, there are several different sites where you can find prices. There are 2 good ones linked below.
Hard to tell with no picture. Try and post it on ValueJockey. The community there can tell you. It is free and you can post pictures. Good Luck.
http://www.valuejockey.com/
1943 Denver mint mark. Steel penny
How much a Harrah's coin is worth depends on the denomination of the coin and the year it was produced. Most coins from Harrah's are only worth their face value, but older coins from this casino may be collectible and more valuable.
Coins are certified by services like NGC or PCGS. It is expensive, so it isn't worth it unless the coins are really, really valuable.
No, if you are talking about the brass coins commonly in circulation. Those coins are only worth $1.
Coins become valuable when they are minted with errors. This is also based on the quantity of coins with errors, as well. Another way that coins may become valuable is when they are very old. And yet another way is if they are made from a precious metal. Coins that are minted from a high percentage of either silver or gold. This is due to the intrinsic value of the metal. A $20 gold piece can be worth hundreds or thousands of dollars. Theoretically, if a one ounce gold coin, originally minted as worth one dollar, may be worth as much as $1300 if it was 100% gold. This is only theoretical, because coins are never minted using 100% of the metal, because they would be too soft.
I keep coins because they're valuable and I love collecting them. It's fun to gather these special pieces!
How much ancient coins are worth depends on where they are from and in what condition they are. It also depends on how rare they are.
Coins are certified by services like NGC or PCGS. It is expensive, so it isn't worth it unless the coins are really, really valuable.
They are gold coins issued by the Government of South Africa. They are worth their weight in gold, depending on the world price of gold. Yes, they are valuable.
It depends on what coins they are.
They are bullion coins and are worth only what the metals they are composed of are worth.
The yellow coins are worth 1, the red coins are worth 2, and the blue coins are worth 3.
1 yocash = 100 coins