Locals can tell through familiarity with the currency, others because the numerical value is normally on the coin.
Many countries issue (or used to issue) 1 cent and 2 cent coins. Please post a new question with the coins' country of origin and their dates.
F value is for coins in fine condition.
If you mean a 1988 Silver Eagle only Proof and bullion coins were struck in that year. From 1986 to 1992, proof Silver Eagle coins were minted at San Francisco and these coins bear the "S" mintmark and have a current retail value of $40.00. Bullion Silver Eagle coins dated 1988 were also struck at San Francisco but do not have mintmarks, the value of these coins depends on the spot price of silver at time of sale. As of today 3-27-11 it's about $37.32
Coins
With the exception of a few very noticeable errors such as broadstruck coins, 99.9999% of bent coins are the result of damage. That makes them worth only their face value or metal value, whichever is higher.
Foreign coins usually cannot be used in other countries. You can cash in foreign coins, but you usually only get a fraction of the value when you do.
Today, each gold coin has its own value. In order to give an accurate answer to this question the denomination and date and condition of each of the coins is needed.
The value of coins comes from how old they are, the condition, and the metal they are made from. Some older coins have different faces because the leaders of countries change over time.
If you are asking about melting silver coins in the US, it is not illegal. I think Canada may have laws against it as do many other countries but as of today the USA does not deem it illegal. There is a recent law (regulation by the Mint) that prohibits melting pennies and nickels for their metal value, as the value of the metal exceeds the face value of the coin. You may still use them as artistic material for sculpture, etc. As the Mint does not produce silver coins anymore, they have no interest in those coins. Bullion producers buy them and melt them by the ton.
Today different colors are used to make it easier to identify coins that are similar in size but with different denominations. That practice is inherited from a time when coins had to be made of metal that was worth roughly the same as its denomination. For example, a US dollar contained about $1 worth of silver, a British pound contained about £1 worth of silver, etc. Copper was used for low-denomination coins because it's inexpensive, silver was used for intermediate-denomination coins, and gold was used for high-denomination coins. Today many countries imitate that pattern by using copper or copper-plating for low-value coins, silver-colored alloys for middle denominations, and gold-colored alloys for high-value coins.
The mint does not drill holes into the coins. If a hole is drilled into a coin it dramatically reduces value. MANY COUNTRIES DRILLED HOLES IN THEIR COINS. THE COINS WERE WORN FOR JEWELRY AND THAT RENDERS THE COIN PRETTY MUCH WORTHLESS.
In 1899 all European countries had a gold currency. The silver and bronze coins for the smaller denominations were 'token' coins in that their metal value was less than their face value. However, in larger quantities they could be changed for gold coins.
The US never made any silver 1 cent coins.
Not for general circulation as the metal is far more valuable the the face value of coins being minted, however silver may be added to very special commemorative coins.
Lincoln cents like this are novelty coins and have no numismatic value, the maps were not applied to the coins by the US Mint. As for value you will have to find someone that wants them or try eBay.
Bullion value as of today is $1,082.00. Retail prices run from $1,330.00- $1,490.00 for circulated coins $1,590.00 for uncirculated coins
As of today bullion value is $541.00. Retail values for circulated coins are $600.00-$750.00 with uncirculated coins at $830.00+